Suat Irmak, Ph.D., Fellow ASABE; Fellow ASCE-EWRI

Suat Irmak, Ph.D., Fellow ASABE; Fellow ASCE-EWRI

  • Professor and Head of Agricultural and Biological Engineering
105A Agricultural Engineering Building
Shortlidge Road

University Park, PA 16802

Areas of Expertise

  • Soil and water resources engineering
  • Impact of climate change on water resources and agro-ecosystem productivity
  • Measurement and modeling of surface energy and water vapor balance
  • Evapotranspiration, transpiration and evaporation
  • Irrigation science and engineering; agro-ecosystem water management
  • Nitrogen management and impacts on water and soil quality
  • Impact of tillage practices on water and energy balance and water productivity
  • Cover crop impact on soil quality (soil health) and water and energy balance
  • Plant abiotic stresses vs productivity
  • Plant phenotyping
  • Measurement and modeling of soil moisture dynamics and soil physical properties
  • Specialty cropping systems
  • Agricultural IoTs

Education

  • Ph.D. Agricultural and Biological Engineering University of Florida, Gainesville, FL
  • MS Soil and Water Resources and Irrigation Engineering Mediterranean University, Antalya/Turkey
  • BSc Agricultural Structures and Irrigation Engineering Cukurova University, Adana/Turkey

Published Refereed Journal Articles

  1. Irmak, S., V. Sharma, A. Haghverdi, A. Jhala, J.O. Payero and M. Drudik. 2021. Alfalfa- and grass-reference crop coefficients for maize under variable and fixed (uniform) rate irrigation and variable rate, fixed rate and pre-plant fertilizer management in three soil types. Agricultural Water Management 243(2021):106489. https://doi.org/10.1016/j.agwat.2020.106489.
  2. Sharma, V., and Irmak. 2021. Comparative analyses of variable and fixed rate irrigation and nitrogen management for maize in different soil types: Part I. Impact on soil-water dynamics and crop evapotranspiration. Agricultural Water Management 246(1):106653 https://doi.org/10.1016/j.agwat.2020.106644.
  3. Sharma, V., and Irmak. 2021. Comparative analyses of variable and fixed rate irrigation and nitrogen management for maize in different soil types: Part II. Plant growth, grain yield, evapotranspiration, production functions and water productivity. Agricultural Water Management 246 (2021):106653. https://doi.org/10.1016/j.agwat.2020.106653.
  4. Sharma, K., Irmak and M.S. Kukal. 2021. Propagation of soil moisture sensing uncertainty into estimation of total soil water, evapotranspiration and irrigation decision-making. Agricultural Water Management 243 (2021):106454. https://doi.org/10.1016/j.agwat.2020.106454.
  5. Lena, B., M. Folegatti, D. Flumignan, Irmak, J. Francisco, A. Diotto, O. Santos, I. Andrade, E. Junior, P. Marques and C. Junior. 2021. Water requirement and crop coefficients of young jatropha (Jatropha curcas L.) trees in a subtropical humid environment. J. Irrigation and Drainage Engineering 2021, 147(7): 04021020. doi:10.1061/(ASCE)IR.1943-4774.0001557.
  6. Wei-Zhen, L., I. Possignolo, X. Qiao, K. DeJonge Irmak, D. Heeren and D. Rudnick. 2021. Utilizing digital image processing and two‑source energy balance model for the estimation of evapotranspiration of dry edible beans in western Nebraska. Irrigation Science https://doi.org/10.1007/s00271-021-00721-7.
  7. Singh, J., Y. Ge, D. Heeren, E. Walter-Shea, C. Neale, Irmak, W. Woldt, G. Bai, S. Bhatti and M. Maguire. 2021. Inter-relationships between water depletion and temperature differential in row crop canopies in a sub-humid climate. Agricultural Water Management 256 (2021) 107061. https://doi.org/10.1016/j.agwat.2021.107061.
  8. Sharma, K., Irmak, M.S. Kukal, M.C. Vuran, A. Jhala and X. Qiao. 2021. Evaluating soil moisture sensing technologies in silt loam and loamy sand soils: Assessment of performance, temperature sensitivity and site- and sensor-specific calibration functions. Transactions of the ASABE 64(4): 1123-1139. https://doi.org/10.13031/trans.14112.
  9. Safa, B., T. Arkebauer, Q. Zhu, A. Suyker and Irmak. 2021. Gap filling of net ecosystem CO2 exchange (NEE) above rainfed maize using Artificial Neural Networks (ANNs). Journal of Software Engineering and Applications 14(5):150-171. https://doi.org/10.4236/jsea.2021.145010.
  10. Singh, A., M. Kukal, C. Shapiro, D. Snow, Irmak and J. Iqbal. 2021. Growth phase-specific evaporative demand and nighttime temperatures determine maize (Zea mays L.) yield deviations as revealed from a long-term field experiment. Agricultural and Forest Meteorology 308-309 (2021) 108543. https://doi.org/10.1016/j.agrformet.2021.108543.
  11. Djaman, K., Irmak, K. Koudahe and S. Allen. 2021. Irrigation management in potato (Solanum tuberosum L.) production: A review. Sustainability 2021, 13, 1504. https:// doi.org/10.3390/su13031504.
  12. Djaman, K., Irmak, K. Koudahe, S. Allen. 2021. Chilling and heat accumulation of fruit and nut trees and flower bud vulnerability to early spring low temperatures in New Mexico: Meteorological approach. Sustainability 2021, 13, 2524. https://doi.org/10.3390/su13052524.
  13. Porter, D., Irmak, F. Lamm, T. Marek and Bradley Rein. 2020. Challenges and opportunities for education in irrigation engineering. Transactions of the ASABE 63(5):1289-1294. https://doi.org/10.13031/trans.13943.
  14. Kukal, M.S., and Irmak. 2020. Interrelationships among water use efficiency and light use efficiency in four row crop canopies. Agrosystems, Geosciences and Environment 2020;3:e20110. https://doi.org/10.1002/agg2.20110.
  15. Kukal, M.S., and Irmak. 2020. Canopy light interactions, use and efficiency in four row crops under optimal growth conditions. Agricultural and Forest Meteorology 284:107887. https://doi.org/10.1016/j.agrformet.2019.107887.
  16. Sharma, V., and Irmak. 2020. Economic comparisons of variable rate irrigation and fertigation with fixed (uniform) rate irrigation and fertigation and pre-plant fertilizer management for maize in three soils. Agricultural Water Management 240 (2020) 106307. https://doi.org/10.1016/j.agwat.2020.106307.
  17. Ale, S., R.D. Harmel, A.P. Nejadhashemi, K.C. DeJonge, Irmak, I. Chaubey and K.R. Douglas-Mankin. 2020. Global Water Security: Current research and priorities for action. Transactions of the ASABE 63(1):49-55. https://doi.org/10.13031/trans.13839.
  18. Kukal, M.S., and Irmak. 2020. Characterization of water use and efficiency dynamics across four C3 and C4 row crops under optimal growth conditions. Agricultural Water Management 227: 105840. https://doi.org/10.1016/j.agwat.2019.105840.
  19. Harmel, R.D., I. Chaubey, S. Ale, A.P. Nejadhashemi, Irmak, K. DeJonge, S. Evett, E.M. Barnes, M. Catley-Carlson, S. Hunt and I. Mani. 2020. Perspectives on Global Water Security. Transactions of the ASABE 63(1): 69-80. https://doi.org/10.13031/trans.13524.
  20. Sandhu, R., and Irmak. 2020. Performance of Hybrid-Maize model in simulating maize growth, grain yield, soil water and evapotranspiration under rainfed, limited and full irrigation using long-term field data. Agricultural Water Management 242 (2020) 106402. https://doi.org/10.1016/j.agwat.2020.106402.
  21. Koehler-Cole, K., R. Elmore, H. Blanco-Canqui, C. Francis, C. Shapiro, C. Proctor, S. Ruis, D. Heeren, Irmak and R. Ferguson. 2020. Cover crop productivity and subsequent soybean yield in the Western Corn Belt. Agronomy Journal 112(4):2649-2663. doi :10.1002/agj2.20232.
  22. Kukal, M., and Irmak. 2020. Impact of irrigation on interannual variability in United States agricultural productivity. Agricultural Water Management 234:106141. doi.org/10.1016/j.agwat.2020.106141.
  23. Salam, A., M.C. Vuran and Irmak. 2020. A statistical impulse response model based on empirical characterization of wireless underground channel. IEEE Transactions on Wireless Communications 2020. doi:10.1109/TWC.2020.2998762.
  24. Taghvaeian, S., A. Andales, L. Allen, I. Kisekka, S. O'Shaughnessy, D. Porter, R. Sui, Irmak, A. Fulton and J. Aguilar. 2020. Irrigation scheduling for agriculture in the United States: The progress made and the path forward. Transactions of the ASABE 63(5):1603-1618. https://doi.org/10.13031/trans.14110.
  25. Barnes, E.R., N.C. Lawrence, S.Z. Knezevic, O. Rodrigues, Irmak and A.J. Jhala. 2020. Weed control and response of yellow and white popcorn hybrids to herbicides. Agronomy Journal 112(1):458-469. https://doi.org/10.1002/agj2.20029.
  26. Barnes, E., N. Lawrence, S. Knezevic, Irmak, O. Rodriguez and A. Jhala. 2020. Dose response of white and yellow popcorn hybrids to glyphosate, a premix of 2,4-D choline/glyphosate, or dicamba. Agronomy Journal 112:2956-2967. https://doi.org/10.1002/agj2.20190.
  27. Irmak, S., A.T. Mohammed, W.L. Kranz, C.D. Yonts and S. van Donk. 2020. Irrigation-yield production functions and irrigation water use efficiency response of drought-tolerant and non-drought-tolerant maize hybrids under different irrigation levels, population densities and environments. Sustainability 12(358):1-28. doi:10.3390/su12010358.
  28. Kukal, M., S. Irmak, H. Walia and L. Odhiambo. 2020. Spatial and temporal performance, calibration and validation of Hargreaves-Samani equation for quantification of grass-reference evapotranspiration in the USA Great Plains. Agronomy Journal 112:4232-4248. https://doi.org/10.1002/agj2.20325.
  29. Barnes, E., S. Knezevic, N. Lawrence, Irmak, O. Rodriguez and A. Jhala. 2020. Control of Velvetleaf (Abutilon theophrasti) at two heights with post-emergence herbicides in Nebraska popcorn. Weed Technology 34:560-567. doi:10.1017/wet.2020.14.
  30. Kukal, M., and Irmak. 2020. Evidence of arithmetical uncertainty in estimates of light and water use efficiency in four row crops. Sustainability 12(2271):1-9. doi:10.3390/su12062271.
  31. Kukal, M.S., Irmak and K. Sharma. 2020. Development and application of a performance and operational feasibility guide to facilitate adoption of soil moisture sensors. Sustainability 12(321):1-20. doi:10.3390/su12010321.
  32. Sharma, V., C. Nicholoson, A. Bergantino, Irmak and D. Peck. 2020. Temporal analysis of meteorological variables and reference evapotranspiration in inter-mountain region of Wyoming. Water 12(2159):1-35. doi:10.3390/w12082159.
  33. Irmak, S., and M. Kukal. 2019. Disk-till vs. no-till maize grass- and alfalfa-reference single (normal) and basal crop coefficients. Agricultural Water Management 226:105815. https://doi.org/10.1016/j.agwat.2019.105815.
  34. Kukal, M., and Irmak. 2019. Irrigation-limited yield gaps: Trends and variability in the United States post-1950. Environmental Research Communications 1:061005. https://doi.org/10.1088/2515-7620/ab2aee.
  35. Irmak, S., M.S. Kukal, A.T. Mohammed and K. Djaman. 2019. Disk-till vs. no-till maize evapotranspiration, microclimate, grain yield, production functions and water productivity. Agricultural Water Management 26(5):177-195. https://doi.org/10.1016/j.agwat.2019.02.006.
  36. Irmak, S., A.T. Mohammed and W.L. Kranz. 2019. Grain yield, crop and basal evapotranspiration, production functions and water productivity response of drought-tolerant and non-drought-tolerant maize hybrids under different irrigation levels, population densities and environments: Part II. In south-central and northeast Nebraska's transition zone and sub-humid environments. Applied Engineering in Agriculture 35(1):83-102. https://doi.org/10.13031/aea.12871.
  37. Sandhu, R., and Irmak. 2019. Performance of AquaCrop model in simulating maize growth, yield, and evapotranspiration under rainfed, limited and full irrigation. Agricultural Water Management 223:105687. https://doi.org/10.1016/j.agwat.2019.105687.
  38. Sandhu, R., and Irmak. 2019. Assessment of AquaCrop model in simulating maize canopy cover, soil-water, evapotranspiration, yield and water productivity for different planting dates and densities under irrigated and rainfed conditions. Agricultural Water Management 224, 105753. https://doi.org/10.1016/j.agwat.2019.105753.
  39. Kukal, M., and Irmak. 2019. Comparative canopy growth dynamics in four row crops and their relationships with allometric and environmental determinants. Agronomy Journal 111(4):1799-1816. doi:10.2134/agronj2019.01.0017.
  40. Mohammed, A.T., Irmak, W.L. Kranz, S. van Donk and C.D. Yonts. 2019. Grain yield, crop and basal evapotranspiration, production functions and water productivity response of drought-tolerant and non-drought-tolerant maize hybrids under different irrigation levels, and population densities: Part I. In western Nebraska's semi-arid environments. Applied Engineering in Agriculture 35(1):65-81. https://doi.org/10.13031/aea.12870.
  41. Zhu, Y., Irmak, A.J. Jhala, M.C. Vuran and A. Diotto. 2019. Time-domain and frequency-domain reflectometry type soil moisture sensor performance and soil temperature effect in fine- and coarse-textured soils. Applied Engineering in Agriculture 35(2):117-134. https://doi.org/10.13031/aea.12908.
  42. Salam, A., M. Vuran, X. Dong, C. Argyropoulos and Irmak. 2019. A theoretical model of underground Dipole Antennas for communications in internet of underground things. IEEE Transactions on Antennas and Propagation 67(6):3996. doi:10.1109/TAP.2019.2902646.
  43. Salam, A., M.C. Vuran and Irmak. 2019. Di-Sense: In situ real-time permittivity estimation and soil moisture sensing using wireless underground communications. Computer Networks 151:31-41. https://doi.org/10.1016/j.comnet.2019.01.001.
  44. Vuran, M.C., A. Salam, R. Wong and Irmak. 2019. Internet of underground things in precision agriculture: Architecture and technology aspects. Ad Hoc Networks 81:160-173. https://doi.org/10.1016/j.adhoc.2018.07.017.
  45. Brar, D., W.L. Kranz, T. Lo, Irmak and D.L. Martin. 2019. Conservation of energy using variable frequency drive for center pivot irrigation: Systems equipped with corner watering attachments. Transactions of the ASABE 62(5):1395-1408. https://doi.org/10.13031/trans.13312.
  46. Sharma, V., and Irmak. 2019. Spatio-temporal magnitudes and trends of cover-crop evapotranspiration in Nebraska, Iowa and Kansas. J. Irrigation and Drainage Engineering 145(2):04018040. doi:10.1061/(ASCE)IR.1943-4774.0001367.
  47. Safa, B., T.J. Arkebauer, Q. Zhu, A. Suyker and Irmak. 2019. Net ecosystem exchange (NEE) simulation in maize using artificial neural networks. Journal of Systems and Control 7(100036):1-10. doi.org/10.1016/j.ifacsc.2019.100036.
  48. Bai, G., Y. Ge, D. Scoby, B. Leavitt, V. Stoerger, N. Kirchgessner, Irmak, G. Graef, J. Schnable and T. Awada. 2019. NU-Spidercam: A large-scale, cable-driven, integrated sensing and robotic system for precision phenotyping, remote sensing, and agronomic research. Computers and Electronics in Agriculture 160(5):71-81. https://doi.org/10.1016/j.compag.2019.03.009.
  49. Barnes, E.R., S.Z. Knezevic, N.C. Lawrence, Irmak, O. Rodriguez and A. Jhala. 2019. Pre-emergence herbicide delays the critical time of weed removal in popcorn. Weed Technology 33:785-793. doi:10.1017/wet.2019.58.
  50. Djaman, K., D. Rudnick, Y. Moukoumbi, A. Sow and Irmak. 2019. Actual evapotranspiration and crop coefficients of irrigated lowland rice (Oryza sativa L.) under semiarid climate. Ital. J. Agronomy 14(1059):19-25. doi:10.4081/ija.2019.1059.
  51. Rudnick, D., Irmak, C. West, I. Kisekka, T.H. Marek, J.P. Schneekloth, D. Mitchell, D. McCallister, V. Sharma, K. Djaman, J. Aguilar, J.L. Chávez, M.E. Schipanski, D.H. Rogers and A. Schlegel. 2019. Deficit irrigation management of maize in the High Plains Aquifer region: A Review. J. American Water Resources Association 55(1):38-55. doi.org/10.1111/1752-1688.12723.
  52. Singh, J., T. Lo, D. Rudnick, Irmak and H. Blanco-Canqui. 2019. Quantifying and correcting for clay content effects on soil water measurement by reflectometers. Agricultural Water Management 216(5):390-399. https://doi.org/10.1016/j.agwat.2019.02.024.
  53. Kukal, M.S., and Irmak. 2018. U.S. Agro-climatology in 20th Century: Growing degree days, first and last frost, growing season length, and impacts on crop yields. Nature Scientific Reports 8(1):6977. doi:10.1038/s41598-018-25212-2.
  54. Kukal, M.S., and Irmak. 2018. Climate-driven crop yield and yield variability and climate change impacts on the U.S. Great Plains agricultural production. Nature Scientific Reports 8(1):3450. doi:10.1038/s41598-018-21848-2.
  55. Irmak, S., V. Sharma, A.T. Mohammed and K. Djaman. 2018. Impacts of cover crops on soil physical properties: Field capacity, permanent wilting point, soil-water holding capacity, bulk density, hydraulic conductivity and infiltration. Transactions of the ASABE 61(4):1307-1321. org/10.13031/trans.12700.
  56. Oliveira, M.C., T. Gaines, E.L. Patterson, A.J. Jhala, Irmak, K. Amundsen and S.Z. Knezevic. 2018. Interspecific and intraspecific transference of metabolism-based Mesotrione resistance in Dioecious Weedy Amaranthus. The Plant Journal 96(5):1051-1063. doi:10.1111/tpj.14089.
  57. Djaman, P.M. Ndiaye, K. Koudahe, A. Bodian, L. Diop and Irmak. 2018. Spatial and temporal trend in monthly and annual reference evapotranspiration in Madagascar for the 1980-2010 period. Int. J. Climatology 2(2):110-120. doi:10.15406/ijh.2018.02.00058.
  58. Yonts, C.D., A. Haghverdi, D.L. Reichert and Irmak. 2018. Deficit irrigation and surface residue cover effects on dry bean yield, in-season soil water content and irrigation water use efficiency in western Nebraska High Plains. Agricultural Water Management 199:138-147. doi.org/10.1016/j.agwat.2017.12.024.
  59. Anderson, R., D. Keshwani, A. Guru H. Yang, Irmak, and J. Subbiah. 2018. An integrated modeling framework for crop and biofuel systems using DSSAT and GREET models. J. Environmental Modelling and Software 108:40-50. doi.org/10.1016/j.envsoft.2018.07.004.
  60. Vuran, M.C., A. Salam, R. Wong and Irmak. 2018. Internet of underground things: Sensing and communications on the field for precision agriculture. IEEE Internet of Things (WF-IoT 2018). 307:586-591. doi:10.1109/WF-IoT.2018.8355096.
  61. Safa, B., T.J. Arkebauer, Q. Zhu, A. Suyker and Irmak. 2018. Latent heat and sensible heat flux simulation in maize using artificial neural networks. Computers and Electronics in Agriculture 154:155-164. doi.org/10.1016/j.compag.2018.08.038.
  62. Sharma, V., Irmak and J. Padhi. 2018a. Effect of cover crops on soil quality: Part I: Soil chemical properties - organic C, total N, pH, EC, organic matter content, NO3-N, and P. J. Soil and Water Conservation 73(6):637-651. doi:10.2489/jswc.73.6.637.
  63. Sharma, V., Irmak and J. Padhi. 2018b. Effect of cover crops on soil quality: Part II. Soil exchangeable bases (K, Mg, Na, Ca) and soil micronutrients (Zn, Mn, Fe, Cu, and B). J. Soil and Water Conservation 73(6):652-668. doi:10.2489/jswc.73.6.652.
  64. Chahal, P., Irmak, M. Jugulam and A. Jhala. 2018. Evaluating effect of degree of water stress on growth and fecundity of Palmer amaranth (Amaranthus palmeri) using soil moisture sensors. Weed Science 66(6):738-745. doi.org/10.1017/wsc.2018.47.
  65. Djaman, K., V.C. Mel,. L. Diop, A. Sow, R. El Namaky, B. Manneh, K. Saito, K. Futakuchi and Irmak. 2018. Effects of alternate wetting and drying irrigation regime and nitrogen fertilizer on yield and nitrogen use efficiency of irrigated rice in the Sahel. Water 10(711):1-20. doi:10.3390/w10060711.
  66. Djaman, K., M. Sall, A. Sow, B. Manneh and Irmak. 2018. Analysis of air temperature and relative humidity measured over rice and grass canopies and their impacts on Penman-Monteith reference evapotranspiration. J. Irrigation and Drainage Engineering 145(1):06018008. doi:10.1061/(ASCE)IR.1943-4774.0001362.
  67. Chahal, P.S., Irmak, T. Gaines, K. Amundsen, M. Jugulam, P. Jha, I.S. Travlos and A.J. Jhala. 2018. Control of photosystem (PS) II- and 4-Hydroxyphenylpyruvate Dioxygenase (HPPD)-inhibitor-resistant Palmer amaranth (Amaranthus palmeri S. Wats.) in conventional corn. Weed Technology 32:326-335. doi: 10.1017/wet.2017.111.
  68. Djaman, K., M. O'Neill, C. Owen, D. Smeal, K. Koudahe, M. West, S. Allen, K. Lombard and Irmak. 2018. Crop evapotranspiration, irrigation water requirement, and water productivity of maize from meteorological data under semiarid climate. Water 10(405):2-17. doi:10.3390/w10040405.
  69. Djaman, K., and Irmak. 2018. Evaluation of critical N and P models for maize under full and limited irrigation conditions. Ital. Journal of Agronomy 13(1):80-92. doi.org/10.4081/ija.2017.958.
  70. Djaman, K., K. Lombard, C. Owen, D. Smeal, K. Koudahe, M. West, S. Allen, D. Begay, M. O'Neill and Irmak. 2018. Long-term winter wheat seasonal irrigation amount, evapotranspiration, yield, and water productivity under semiarid climate. Agronomy 8(96):1-16. doi:10.3390/agronomy8060096.
  71. Barker, J., D. Heeren, K. Koehler-Cole, C. Shapiro, H. Blanco-Canqui, R. Elmore, C. Proctor, Irmak, C. Francis, T. Shaver and A. Mohammed. 2018. Soil water storage of cover crops in maize and soybean in Nebraska. Agronomy Journal 110(5):1718-1730. doi:10.2134/agronj2017.12.0739.
  72. Ringenberg, D., W. Kranz, Irmak and B. Dvorak. 2018. Extending Extension's Outreach: Efficacy of using student interns to obtain implementation of irrigation improvements. Journal of Extension 56(4):1-6.
  73. Kukal, M., and Irmak. 2017. Spatial and temporal changes in maize and soybean grain yields, precipitation use efficiency and crop water use efficiency in the USA Great Plains. Transactions of the ASABE 60(4):1189-1208. doi 10.13031/trans.12072.
  74. Djaman, K., Irmak, M. Sall, A. Sow and K. Koudahe and I. Kabenge. 2017. Comparison of sum-of-hourly and daily time step standardized ASCE Penman-Monteith (ASCE-PM) grass-reference evapotranspiration in Western Africa. Theoretical and Applied Climatology. doi.org/10.1007/s00704-017-2291-6.
  75. Djaman, K., Irmak and K. Futakuchi. 2017. Daily reference evapotranspiration estimation under limited data in eastern Africa. J. Irrigation and Drainage Engineering 143(4):06016015. doi:10.1061/(ASCE)IR.1943-4774.0001154.
  76. Sharma, V., and Irmak. 2017. Soil-water dynamics, evapotranspiration, and crop coefficients of cover crop mixtures in seed maize-cover crop rotation fields: Part II. Grass- and alfalfa-reference single (normal) and basal crop coefficients. J. Irrigation and Drainage Engineering 143(9):04017033. doi:10.1061/(ASCE)IR.1943-4774.0001215.
  77. Kukal, M., Irmak and A. Kilic. 2017. Long-term spatial and temporal maize and soybean evapotranspiration derived from ground and satellite-based NDVI datasets over the USA Great Plains. J. Irrigation and Drainage Eng. 143(9):04017031. doi:10.1061/(ASCE)IR.1943-4774.0001212.
  78. Aegerter, C., J. Wang, B. Oglesby, Irmak, B. Wardlow, H. Yang and C. Ge. 2017. Mesoscale modeling of the meteorological impacts of irrigation during the 2012 Central Plains drought. J. Applied Meteorology and Climatology 56:1259-1283. doi:10.1175/JAMC-D-16-0292.1.
  79. Djaman, K., K. Kouhade, S. Allen, M. O"Neill and Irmak. 2017. Validation of Valiantzas' reference evapotranspiration equation under different climatic conditions. J. Irrigation and Drainage Systems Engineering 6(3):1-7. doi:10.4172/2168-9768.1000196.
  80. Haghverdi, A., D. Yonts, D.L. Reichert and S. Irmak. 2017. Impact of irrigation, surface residue cover and plant population on sugarbeet growth and yield, irrigation water use efficiency and soil water dynamics. Irrigation Science 180:1-12. doi.org/10.1016/j.agwat.2016.10.018.
  81. Oliveira, M.C., A. Jhala, T. Gaines, S. Irmak, K. Amundsen, J. Scott and S. Knezevic. 2017. Confirmation and control of HPPD-inhibiting Common Waterhemp (Amaranthus tuberculatus) in Nebraska. Weed Technology 31(1):67-79. https://doi.org/10.1017/wet.2016.4.
  82. Sarangi, D., A.J. Tyre, E. Patterson, T.A. Gaines, Irmak, S.Z. Knezevic, J. Lindquist and A.J. Jhala. 2017. Pollen-mediated gene flow from glyphosate-resistant Common Waterhemp (Amaranthus rudisSauer): Consequences for the dispersal of resistance genes. Nature Scientific Reports 7:44913. doi:10.1038/srep44913.
  83. Djaman, K., V. Sharma, D. Rudnick, Irmak, K.A. Amouzou, J.M. Sogbedji and K. Koudahe. 2017. Spatial and temporal variation in rainfall in Togo during the 1961-2001 period. Int. J. Hydrology 1(4):00019. doi:10.15406/ijh.2017.01.00019.
  84. Sarangi, D., L. Sandell, S.Z. Knezevic, J.L. Lindquist, Irmak and A.J. Jhala. 2017. Comparison of herbicide programs for season-long control of glyphosate-resistant Common Waterhemp (Amaranthus rudis) in soybean. Weed Technology 31:53-66. doi.org/10.1017/wet.2016.1.
  85. Djaman, K., V. Mel, A. Balde, B. Bado, B. Manneh, L. Diop, D. Mutiibwa, D. Rudnick, Irmak and K. Futakuchi. 2017. Evapotranspiration, irrigation water requirement and water productivity of rice (Oryza sativa L.) in the Sahelian environment. Paddy and Water Environment 15(3):469-482. doi:10.1007/s10333-016-0564-9.
  86. Brar, D., W. Kranz, T. Lo, Irmak and D. Martin. 2017. Conservation of energy using variable frequency drive for center pivot irrigation: Standard systems. Transactions of the ASABE 60(1):95-106. doi:10.13031/trans.11683.
  87. Djaman, K., A.B. Balde, K.B. Muller, D. Rudnick and Irmak. 2017. Long-term trend analysis in climate variables and agricultural adaptation strategies to climate change in the Senegal River Basin. Int. J. Climatology (Royal Meteorological Society). 37(6):2873-2888. doi:10.1002/joc.4885.
  88. Djaman, K., D. Rudnick, D. Mutiibwa, L. Diop, M. Sall, I. Kabenge, A. Bodian, H. Tabari and Irmak. 2017. Evaluation of the Valiantzas' simplified forms of the FAO-56 Penman-Monteith reference evapotranspiration model under humid climate. J. Irrigation and Drainage Engineering. 143(8):06017005-1. doi:10.1061/(ASCE)IR.1943-4774.0001191.
  89. Salam, A., M.C. Vuran and Irmak. 2017. Towards internet of underground things in smart lighting: A statistical model of wireless underground channel. ICNSC 2017. IEEE Networking, Sensing and Control. 304:574-579. doi:10.1109/ICNSC.2017.8000155.
  90. Sharma, V., Irmak, V. Sharma, K. Djaman and L. Odhiambo. 2017. Soil-water dynamics, evapotranspiration and crop coefficients of cover crop mixtures in seed maize-cover crop rotation fields: Part I. Soil-water dynamics and evapotranspiration. J. Irrigation and Drainage Engineering 143(9):04017032. doi:10.1061/(ASCE)IR.1943-4774.0001214.
  91. Yan, Q., H. Yang, M.C. Vuran and Irmak. 2017. SPRIDE: Scalable and private continual geo-distance evaluation for precision agriculture. IEEE Communications and Network Security. CFP17CNM-ART:1-9. doi:10.1109/CNS.2017.8228620.
  92. Koudahe, K., K. Djaman, A. Bodian, Irmak, M. Sall, L. Diop, A.B. Balde and D. Rudnick. 2017. Trend analysis in rainfall, reference evapotranspiration and aridity index in Southern Senegal: Adaptation to the vulnerability of rainfed rice cultivation to climate change. Atmospheric and Climate Sciences7(4):476-495. doi.org/10.4236/acs.2017.74035.
  93. Rudnick, D., Irmak, K. Djaman and V. Sharma. 2017. Impact of irrigation and nitrogen fertilizer rate on soil water dynamics and maize actual evapotranspiration during the vegetative and reproductive periods. Agric. Water Management 191:77-84. dx.doi.org/10.1016/j.agwat.2017.06.007.
  94. Djaman K., K. Koudahe, C.O. Akinbile and Irmak. 2017. Evaluation of eleven reference evapotranspiration models in semiarid conditions. J. Water Resource and Protection 9:1469-1490. doi.org/10.4236/jwarp.2017.912094.
  95. Djaman, K., K. Koudahe, M. Sall, I. Kabenge, D. Rudnick and Irmak. 2017. Performance of twelve mass transfer-based reference evapotranspiration models under humid climate. J. Water Resource and Protection 9:1347-1363. doi.org/10.4236/jwarp.2017.912086.
  96. Irmak, S., and K. Djaman. 2016. Effects of planting date and density on plant growth, yield, evapotranspiration, and irrigation- and evapotranspiration-yield production functions of maize (Zea mays) under subsurface drip irrigation and rainfed conditions. Transactions of the ASABE 59(5): 1235-1256. doi:10.13031/trans.59.11169.
  97. Kukal, M., and Irmak. 2016. Long-term patterns of air temperatures, daily temperature range, precipitation, grass-reference evapotranspiration and aridity index in the USA Great Plains: Part I. Spatial trends. Journal of Hydrology. 542:953-977. dx.doi.org/10.1016/j.jhydrol.2016.06.006.
  98. Kukal, M., and Irmak. 2016. Long-term patterns of air temperatures, daily temperature range, precipitation, grass-reference evapotranspiration and aridity index in the USA Great Plains: Part II. Temporal trends. Journal of Hydrology. 542:978-1001. dx.doi.org/10.1016/j.jhydrol.2016.06.008.
  99. Djaman, K., Irmak, I. Kabenge and K. Futakuchi. 2016. Evaluation of FAO-56 Penman-Monteith model with limited data and the Valiantzas models for estimating grass-reference evapotranspiration in the Sahelian conditions. J. Irrigation and Drainage Engineering. 142(11):04016044 (p. 1-14). doi:10.1061/(ASCE)IR.1943-4774.0001070.
  100. Irmak, S., and G.M. Arellano. 2016. Reference (potential) evapotranspiration: Part II. Frequency distribution in humid, subhumid, arid, semiarid and Mediterranean-type climates. Irrigation and Drainage Engineering 142(4):1-11. 04015066. doi:10.1061/(ASCE)IR.1943-4774.0000979, 04015066.
  101. Arellano, G.M., and Irmak. 2016. Reference (potential) evapotranspiration: Part I. Comparison of temperature, radiation, and combination-based energy balance equations in humid, subhumid, arid, semiarid and Mediterranean-type climates. J. Irrigation and Drainage Engineering 142(4):04015065 (p. 1-21). doi:10.1061/(ASCE)IR.1943-4774.0000978.
  102. Sharma, V., Irmak, K. Djaman and V. Sharma. 2016. Large-scale spatial and temporal variability in evapotranspiration, crop water use efficiency, and evapotranspiration water use efficiency for irrigated and rainfed maize and soybean. J. Irrigation and Drainage Engineering 142(3):04015063. doi:10.1061/(ASCE)IR.1943-4774.0000985.
  103. Sharma, V., A. Kilic and Irmak. 2016. Impact of scale/resolution on evapotranspiration from LANDSAT and MODIS images. Water Resources Research 52:1-20. doi:10.1002/2015WR017772.
  104. Salam, A., M.C. Vuran and Irmak. 2016. Pulses in the sand: Impulse response analysis of wireless underground channel. IEEE INFOCOM. doi:10.1109/INFOCOM.2016.7524457.
  105. Amatya, D.M., Irmak, P. Gowda, G. Sun, J.E. Nettles and K.R. Douglas-Mankin. 2016. Ecosystem evapotranspiration: Challenges in measurements, estimates and modeling. Transactions of the ASABE 59(2):555-560.
  106. Wang, J., A.L. Kessner, C. Aegerter, A. Sharma, L. Judd, B. Wardlow, J. You, M. Shulski, Irmak, A. Kilic and J. Zeng, 2016. A multi-sensor view of the 2012 Central Plains drought from space. Frontiers in Environmental Science 4(45):1-13. dx.doi.org/10.3389/fenvs.2016.00045.
  107. Sharma, V., Irmak, A. Kilic, V. Sharma, J.E. Gilley, G.E. Meyer, S.Z. Knezevic and D. Marx. 2016. Quantification and mapping of surface residue cover and tillage practices for maize and soybean fields in south central Nebraska-USA using Landsat imagery. Transactions of the ASABE 59(3):925-939. doi:10.13031/trans.59.11489.
  108. Diotto, A.V., and Irmak. 2016. Embodied energy and return of investment energy analyses in maize production for grain and ethanol under surface (furrow)-, center pivot-, and subsurface drip irrigation with disk-till and no-till practices. Transactions of the ASABE 59(3):873-884. doi:10.13031/trans.59.11331.
  109. Djaman, K., A.B. Balde, L. Diop, K. Futakuchi and Irmak. 2016. Analyses, calibration and validation of evapotranspiration models to predict grass-reference evapotranspiration in the Senegal River Delta. Journal of Hydrology 8:82-94. dx.doi.org/10.1016/j.ejrh.2016.06.003.
  110. Rudnick, D., Irmak, R. Ferguson, T. Shaver, K. Djaman, G. Slater, A. Bereuter, N. Ward, D. Francis, M. Schmer, B. Wienhold and S. Van Donk. 2016. Economic return vs crop water productivity of maize for various nitrogen rates under full irrigation, limited irrigation, and rainfed settings in south central Nebraska. J. Irrigation and Drainage Engineering 142(6):1-12. 04016017. doi:10.1061/(ASCE)IR.1943-4774.0001023.
  111. Irmak, S., Djaman and D.R. Rudnick. 2016. Effect of full and limited irrigation rate and frequency on subsurface drip-irrigated maize evapotranspiration, yield, water use efficiency and yield response factors. Irrigation Science 34(4):271-286. doi10.1007/s00271-016-0502-z.
  112. Irmak, S. 2015. Inter-annual variation in long-term center pivot-irrigated maize evapotranspiration (ET) and various water productivity response indices: Part I. Grain yield, actual and basal ET, irrigation-yield production functions, ET-yield production functions, and yield response factors. Irrigation and Drainage Engineering 141(5):1-17. 04014068. doi:10.1061/(ASCE)IR.1943-4774.0000825.
  113. Irmak, S. 2015. Inter-annual variation in long-term center pivot-irrigated maize evapotranspiration (ET) and various water productivity response indices: Part II. Irrigation water use efficiency (IWUE), crop WUE, evapotranspiration WUE, irrigation-evapotranspiration use efficiency, and precipitation use efficiency. Irrigation and Drainage Engineering 141(5):1-11. 04014069. doi:10.1061/(ASCE)IR.1943-4774.0000826.
  114. Irmak, S., and V. Sharma. 2015. Large scale and long-term trends and magnitudes in irrigated and rainfed maize and soybean water productivity: Grain yield, evapotranspiration, crop water use efficiency, and yield production functions. Transactions of the ASABE 58(1):103-120.
  115. Irmak, S., K. Djaman and V. Sharma. 2015. Winter wheat (Triticum aestivum) evapotranspiration and single and basal crop coefficients. Transactions of the ASABE 58(4):1047-1067.
  116. Irmak, S., E. Specht, L. Odhiambo, J.M. Rees and K.G. Cassman 2015. Soybean yield, water productivity, evapotranspiration and soil-water extraction response to subsurface drip irrigation. Transactions of the ASABE 57(3):729-748. doi:10.13031/trans.57.10085.
  117. Mitchell, J.P., A. Shrestha and Irmak. 2015. Trade-offs between winter cover crop production and soil water depletion in California's San Joaquin Valley. J. Soil and Water Conservation 70(6):430-440. doi:10.2489/jswc.70.6.430. ­
  118. Sharma, V., Irmak, A. Kilic and D. Mutiibwa. 2015. Application of SEBS for quantifying and mapping surface energy fluxes in south central Nebraska, USA: Analyses with respect to field measurements. Transactions of the ASABE 58(5):1265-1285.
  119. Odhiambo, L., and Irmak. 2015. Surface energy balance, evapotranspiration, and surface coefficients during non-growing season in a maize-soybean cropping system. Transactions of the ASABE 58(3):667-684.
  120. Sarangi, D., Irmak, J.L. Lindquist, S.Z. Knezevic and A.J. Jhala. 2015. Effect of water stress on growth and fecundity of glyphosate-resistant and -susceptible Common Waterhemp. Weed Science 64:42-52.
  121. Rudnick, D.R., K. Djaman and Irmak. 2015. Performance and hysteresis analyses of capacitance and electrical resistance sensors in a silt-loam soil. Transactions of the ASABE 58(3):649-665.
  122. Djaman, K., A.B. Balde, A. Sow, B. Muller, Irmak, M.K. Ndiaye, B. Manneh, Y.D. Moukoumbi, K. Futakuchi and K. Saito. 2015. Evaluation of sixteen reference evapotranspiration methods under Sahelian conditions in the Senegal River Valley. Journal of Hydrology: Regional Studies 3:139-159. 10.1016/j.ejrh.2015.02.002.
  123. Odhiambo, L., and Irmak. 2015. Relative evaporative losses and water balance in subsurface drip- and center pivot-irrigated soybean fields. J. Irrigation and Drainage Eng. 141(11):1-17. 04015020.
  124. Rudnick, D.E., V. Sharma, G.E. Meyer and Irmak. 2015. Using fuzzy logic to predict and evaluate the impact of temporal and spatial precipitation on rainfed maize and soybean yields in Nebraska. Transactions of the ASABE 58(5):1215-1229.
  125. Sarangi, D., L.D. Sandell, S.Z. Knezevic, J.S. Aulakh, J.L. Lindquist, Irmak and A.J. Jhala. 2014. Conformation and control of Glyphosate-resistant Common Waterhemp (Amaranthus rudis) in Nebraska. Weed Technology 29:82-92. doi:10.1614/WT-D-14-00090.1.
  126. Rudnick, D.R., and Irmak. 2014. Spatial and temporal maize soil-water extraction (depletion) dynamics: Part I. Development and evaluation of a soil-water extraction model. Transactions of the ASABE 57(2):431-444.
  127. Rudnick, D.R., and Irmak. 2014. Spatial and temporal maize soil-water extraction (depletion) dynamics: Part II. Impact of water and nitrogen management strategies on soil-water extraction. Transactions of the ASABE 57(2):445-462.
  128. Mutiibwa, D., A. Kilic and Irmak. 2014. The effect of land cover/land use changes on the regional climate of the U.S.A. High Plains. Climate 2(3):153-167. doi:10.3390/cli2030153.
  129. Torrion, J.A., T.D. Setiyono, G.L. Graef, K.G. Cassman, Irmak and J.E. Specht. 2014. Agronomic impacts of deferred, deficit, and full-season irrigation strategies. Crop Science 54:1-14. doi:10.2135/cropsci2014.03.0261.
  130. Rudnick, D.R., and Irmak. 2014. Impact of nitrogen fertilizer on maize evapotranspiration crop coefficients under fully-irrigated, limited irrigation, and rainfed settings. J. Irrigation and Drainage Engineering, 140(12):04014039. doi:10.1061/(ASCE)IR.1943-4774.0000778.
  131. Rudnick, D.R., and Irmak. 2014. Implementation of soil water extraction model on a spatial domain using field capacity and apparent electrical conductivity relationships. Transactions of the ASABE 57(5):1359-1373.
  132. Irmak, S., K.E. Skaggs and S. Chatterjee. 2014. A review of the Bowen ratio surface energy balance method for quantifying evapotranspiration and other surface energy fluxes. Transactions of the ASABE 57(6):1657-1674.
  133. Irmak, S., A. Kilic and S. Chatterjee. 2014. On the uncertainty in inequality of latent and sensible heat energy transfer coefficients of the Bowen ratio theory: Another look at the potential causes of inequalities. Climate 2:181-205, doi:10.3390/cli2030181.
  134. Irmak, S., J.O. Payero, A. Kilic, L. Odhiambo, V. Sharma, D. Rudnick and D. Billesbach. 2014. On the magnitude and dynamics of eddy covariance residual energy (energy closure) from a subsurface drip-irrigated maize field during growing and non-growing (dormant) seasons. Irrigation Science 32:471-483. doi:1007/s00271-014-0443-3.
  135. Irmak, S., L. Odhiambo, J.E. Specht and K. Djaman. 2013. Hourly and daily single and basal evapotranspiration crop coefficients as a function of growing degree days, days after emergence, leaf area index, fractional green canopy cover, and plant phenology for soybean. Transactions of the ASABE 56(5):1785-1803.
  136. Irmak, S., Kabenge, I., D. Rudnick, S. Knezevic, D. Woodward and M. Moravek. 2013. Evapotranspiration crop coefficients for mixed riparian plant community and transpiration crop coefficients for phragmites, cottonwood and peach-leaf willow in the Platte River Basin, Nebraska-USA. Journal of Hydrology 481:177-190.
  137. Irmak, S., D. Mutiibwa, J.O. Payero, T. Marek and D. Porter. 2013. Modeling canopy resistance on hourly time steps from micrometeorological and plant variables for one-step estimation of actual crop evapotranspiration. Journal of Hydrology 507:1-18. dx.doi.org/10.1016/j.jhydrol.2013.10.008.
  138. Mutiibwa, D., and Irmak. 2013. AVHRR-NDVI-based crop coefficients for analyzing long-term trends in evapotranspiration in relation to changing climate in the USA High Plains. Water Resources Research 49(1):231-244. doi:10.1029/2012WR012591.
  139. Rudnick, D.R., and Irmak. 2013. Impact of water and nitrogen management strategies on maize yield and water productivity indices under linear-move sprinkler irrigation. Transactions of the ASABE 56(5):1769-1783.
  140. Payero, J.O., and Irmak. 2013. Daily energy fluxes, evapotranspiration and crop coefficients of soybean. Agric. Water Management 129:31-43. dx.doi.org/10.1016/j.agwat.2013.06.018.
  141. Mutiibwa, D., and Irmak. 2013. Transferability of Jarvis-type models developed/re-parameterized for specific crops to estimate stomatal resistance for other crops: Analyses on model calibration, validation, performance, sensitivity, and elasticity. Transactions of the ASABE 56(2):409-422.
  142. Kabenge, I., Irmak, G.E. Meyer, J.E. Gilley, S. Knezevic, T.J. Arkebauer, D. Woodward and M. Moravek. 2013. Evapotranspiration and surface energy balance of a common reed-dominated riparian system in the Platte River Basin, central Nebraska, USA. Transactions of the ASABE 56(1):135-153.
  143. Djaman, K., Irmak, D.L. Martin, R.B. Ferguson and M.L. Bernards. 2013. Plant nutrient uptake and soil nutrient dynamics under full and limited irrigation and rainfed maize production. Agronomy Journal 105(2):527-538. doi:10.2134/agronj2012.0269.
  144. Djaman, K., and Irmak. 2013. Actual crop evapotranspiration and alfalfa- and grass-reference crop coefficients of maize under full and limited irrigation and rainfed conditions. J. Irrigation and Drainage Engineering 139(6):433-446.
  145. Djaman, K., Irmak, W.R. Rathje, D.L. Martin and D.E. Eisenhauer. 2013. Maize evapotranspiration, yield production functions, biomass, grain yield, harvest index, and yield response factors under full and limited irrigation. Transactions of the ASABE 56(2):273-293.
  146. Sharma, V., D.R. Rudnick and Irmak. 2013. Development and evaluation of ordinary least square regression models for predicting irrigated and rainfed maize and soybean yields. Transactions of the ASABE 56(4):1361-1378.
  147. Dong, X., M.C. Vuran and Irmak. 2013. Autonomous precision agriculture through integration of wireless underground sensor networks with center pivot systems. Ad Hoc Networks 11(7):1975-1987. dx.doi.org/10.1016/j.adhoc.2012.06.012.
  148. Knezevic, S., R. Rapp, A. Datta and Irmak. 2013. Common reed (Phragmites australis) control as influenced by the timing of herbicide application. Int. J. Pest Management 59(3):224-228. doi:10.1080/09670874.2013.830796.
  149. Lagos, L.O., D.L. Martin, S.B. Verma, Irmak, A. Irmak, D.E. Eisenhauer and A. Suyker. 2013. Surface energy balance model of transpiration and evaporation from residue-covered or bare-soil systems: Model evaluation. Irrigation Science 31(2):135-150. doi:10.1007/s00271-011-0298-9.
  150. Irmak, S., Kabenge, K. Skaggs and D. Mutiibwa. 2012. Trend and magnitude of changes in climate variables and reference evapotranspiration over 116-year period in the Platte River Basin, central Nebraska-USA. Journal of Hydrology 420-421: 228-244.
  151. Skaggs, K.E., and Irmak. 2012. Long-term trends in air temperature distribution and extremes, growing degree days, and spring and fall frosts for climate impact assessments on agricultural practices in Nebraska, USA. J. Applied Meteorology and Climatology 51:2060-2073. doi:dx.doi.org/10.1175/JAMC-D-11-0146.1.
  152. Kabenge, I., and Irmak. 2012. Evaporative losses from a phragmites (Common Reed)-dominated peach-leaf willow and cottonwood riparian plant community. Water Resources Research 48:1-17, W09513, doi:10.1029/2012WR011902.
  153. Irmak, S., Burgert, H. Yang, K. Cassman, D. Walters, W. Rathje, J. Payero, P. Grassini, M. Kuzila, K. Brunkhorst, B. VanDeWalle, J. Rees, W. Kranz, D. Eisenhauer, C. Shapiro, G. Zoubek and G. Teichmeier. 2012. Large scale on-farm implementation of soil moisture-based irrigation management strategies for increasing maize water productivity. Transactions of the ASABE 55(3):881-894.
  154. Sharma, V., and Irmak. 2012. Mapping spatially interpolated precipitation, reference evapotranspiration, actual crop evapotranspiration, and net irrigation requirements: Part I. Precipitation and reference evapotranspiration. Transactions of the ASABE 55(3):907-921.
  155. Sharma, V., and Irmak. 2012. Mapping spatially interpolated precipitation, reference evapotranspiration, actual crop evapotranspiration, and net irrigation requirements: Part II. Actual crop evapotranspiration and net irrigation requirements. Transactions of the ASABE 55(3):923-936.
  156. Djaman, K., and Irmak. 2012. Soil water extraction patterns and crop-, irrigation-, and evapotranspiration water use efficiency of maize under full and limited irrigation and rainfed settings. Transactions of the ASABE 55(4):1223-1238.
  157. Skaggs, K.E., and Irmak. 2012. Analysis of microclimate data measured over grass and soybean canopy and their impacts on Penman-Monteith grass and alfalfa-reference evapotranspiration. J. Irrigation and Drainage Engineering 138(2) 120-134.
  158. Odhiambo, L., and Irmak. 2012. Evaluation of the impact of surface residue cover on single and dual crop coefficient methods for estimating soybean actual evapotranspiration. Agricultural Water Management 104:221-234.
  159. Torrion, J., T. Setiyono, K. Cassman, R. Ferguson, Irmak and J. Specht. 2012. Soybean root development relative to vegetative and reproductive phenology. Agronomy Journal 104(6):1702-1709.
  160. Porter, D., P. Gowda, T. Marek, T. Howell, J. Moorehead and Irmak. 2012. Sensitivity of grass and alfalfa-reference evapotranspiration to sensor accuracy. Applied Engineering in Agriculture 28(4):543-549.
  161. Rapp, R.E., A. Datta, Irmak, T. Arkebauer and S.Z. Knezevic. 2012. Integrated management of common reed (Phragmites australis) along the Platte River in Nebraska. Weed Technology 26(2):326-333.
  162. Tooker, J., X. Dong, M.C, Vuran and Irmak. 2012. Connecting soil to the cloud: A wireless underground sensor network testbed. IEEE Ad Hoc Communications and Networks (SECON). 978(1):4673-1905-8/12: p. 79-81.
  163. Irmak, S. On the dynamics of nocturnal, daytime and sum-of-hourly evapotranspiration and other surface energy fluxes over a non-stressed maize canopy. J. Irrigation and Drainage Engineering 137(8):475-490.
  164. Irmak, S., L. Odhiambo and D. Mutiibwa. 2011. Assessing the impact of daily net radiation models on grass and alfalfa-reference evapotranspiration estimated using Penman-Monteith equation in a sub-humid and arid climate. Irrigation and Drainage Engineering 137(2):59-72.
  165. Mutiibwa, D., and Irmak. 2011. On the scaling up soybean leaf level stomatal resistance to canopy resistance for one-step estimation of actual evapotranspiration. Transactions of the ASABE 54(1):141-154.
  166. Grassini, P., H. Yang, Irmak, J. Thorburn, C. Burr and K.G. Cassman. 2011. High-yield irrigated maize in Western U.S. Corn-Belt II. Irrigation management and crop water productivity. Field Crops Research 120:133-141.
  167. Odhiambo, L., and Irmak. 2011. Evaluation of Extended Shuttleworth-Wallace Model for estimating and partitioning of evapotranspiration in a partial residue-covered subsurface drip-irrigated soybean field. Transactions of the ASABE 54(3):915-930.
  168. Skaggs, K.E., and Irmak. 2011. Characterization of nighttime evapotranspiration and other surface energy fluxes and interactions with microclimate variables in subsurface drip and center pivot-irrigated soybean fields. Transactions of the ASABE 54(3):941-952.
  169. Sharma, V., A. Irmak, I. Kabenge and Irmak. 2011. Application of GIS and geographically-weighted regression to evaluate spatial non-stationarity relationships between precipitation vs. irrigated and rainfed maize and soybean yields. Transactions of the ASABE 54(3):953-972.
  170. Abunyewa, A., R. Ferguson, C. Wortmann, D. Lyon, S. Mason, Irmak and R. Klein. 2011. Grain sorghum water use with skip-row configuration in the Central Great Plains. A. J. Agric. Res. 6(23):5328-5338.
  171. Irmak, S., and D. Mutiibwa. 2010. On the dynamics of canopy resistance: Generalized-linear estimation and its relationships with primary micrometeorological variables. Water Resources Research 46:1-20, W08526. doi:10.1029/2009WR008484.
  172. Irmak, S. 2010. Nebraska Water and Energy Flux Measurement, Modeling, and Research Network (NEBFLUX). Transactions of the ASABE 53(4):1097-1115.
  173. Irmak, S., Mutiibwa and J.O. Payero. 2010. Net radiation dynamics: Performance of 20 daily net radiation models as related to model structure and intricacy in two climates. Transactions of the ASABE 53(4):1059-1076.
  174. Irmak, A., P. Ranade, Marx, S. Irmak, K.G. Hubbard, G. Meyer and D.L. Martin. 2010. Spatial interpolation of climate variables in Nebraska. Transactions of the ASABE 53(6):1759-1771.
  175. Irmak, S., J. Rees, G. Zoubek, B. vanDeWalle, W. Rathje, R. DeBuhr, D. Leininger, D. Siekman, J. Schneider and A. Christiansen. 2010. Nebraska Agricultural Water Management Demonstration Network (NAWMDN): Integrating Research and Extension/Outreach. Applied Engineering in Agriculture 26(4):599-613.
  176. Hay, C.H., and Irmak. 2010. Recursive and explicit combination-based energy balance equations for calculating reference evapotranspiration in relation to Bowen ratio measurements. Transactions of the ASABE 53(6):1799-1810.
  177. Van Donk, S.J., D.L. Martin, Irmak, S.R. Melvin, J.L. Petersen and D.R. Davison. 2010. Crop residue cover effects on evaporation, soil water content, and yield of deficit-irrigated corn in west-central Nebraska. Transactions of the ASABE 53(6):1787-1797.
  178. Irmak, S., and D. Mutiibwa. 2009. On the dynamics of stomatal resistance: Relationships between stomatal behavior and micrometeorological variables and performance of Jarvis-type parameterization. Transactions of the ASABE 52(6):1923-1939.
  179. Irmak, S., and D. Mutiibwa. 2009. On the dynamics of evaporative losses from Penman-Monteith with fixed and variable canopy resistance during partial and complete maize canopy. Transactions of the ASABE 52(4):1139-1153.
  180. Irmak, S., and L. Odhiambo. 2009. Impact of microclimatic data measured above maize and grass canopies on Penman-Monteith reference evapotranspiration calculations. Transactions of the ASABE 52(4):1155-1169.
  181. Lagos, O., D.L. Martin, S. Verma, A. Suyker and Irmak. 2009. Surface energy balance model of transpiration from variable canopy cover and evaporation from residue-covered or bare soil systems. Irrigation Science 28:51-64.
  182. Ortega-Farias, S., Irmak and R.H. Cuenca. 2009. Special issue on evapotranspiration measurement and modeling. Irrigation Science 28:1-3.
  183. Hay, C.H., and Irmak. 2009. Actual and reference evaporative losses and surface coefficients of a maize field during non-growing (dormant) periods. J. Irrigation and Drainage Eng. 135(3):313-322.
  184. Payero, J.O., D.D. Tarkalson, Irmak, D. Davison and J. Petersen. 2009. Effect of irrigation timing of a deficient water allocation on corn evapotranspiration, yield, water use efficiency, and dry matter production in a semiarid climate. Agricultural Water Management 96:1387-1397.
  185. Irmak, S., and D. Mutiibwa. 2008. Dynamics of photosynthetic photon flux density and light extinction coefficient for assessing radiant energy interactions for maize canopy. Transactions of the ASABE 51(5):1663-1673.
  186. Irmak, S., Mutiibwa, A. Irmak, T.J. Arkebauer, A. Weiss, D.L. Martin and D.E. Eisenhauer. 2008. On the scaling up leaf stomatal resistance to canopy resistance using photosynthetic photon flux density. Agricultural and Forest Meteorology 148(6-7):1034-1044.
  187. Irmak, A., Irmak and D.L. Martin. 2008. Reference and crop evapotranspiration in south central Nebraska: I. Comparison and analysis of grass and alfalfa-reference evapotranspiration. J. Irrigation and Drainage Engineering 134(6):690-699.
  188. Irmak, A., and Irmak. 2008. Reference and crop evapotranspiration in south central Nebraska: II. Measurement and estimation of actual evapotranspiration. J. Irrigation and Drainage Engineering 134(6):700-715.
  189. Irmak, S., A. Irmak, T.A. Howell, D.L. Martin, J.O. Payero and K.S. Copeland. 2008. Variability analyses of alfalfa-reference to grass-reference evapotranspiration ratios in growing and dormant seasons. Irrigation and Drainage Engineering 134(2):147-159.
  190. Irmak, S., Istanbulluoglu and A. Irmak. 2008. An evaluation of evapotranspiration model complexity versus performance in comparison with Bowen ratio energy balance measurements. Transactions of the ASABE 51(4):1295-1310.
  191. Singh, R.K., A. Irmak, Irmak and D.L. Martin. 2008. Application of SEBAL for mapping evapotranspiration and estimating surface energy fluxes in south central Nebraska. J. Irrigation and Drainage Engineering 134(3):273-285.
  192. Payero, J.O., D.D. Tarkalson and Irmak, D. Davison, and J.L. Petersen. 2008. Effect of irrigation amounts applied with subsurface drip irrigation on corn evapotranspiration, yield, water use efficiency, and dry matter production in a semi-arid climate. Agricultural Water Management 95:895-908.
  193. Payero, J.O., and Irmak. 2007. Design, construction, installation, and performance of two large repacked weighing lysimeters for measuring crop evapotranspiration. Irrigation Science 26(2):191-202.
  194. Irmak, A., J.W. Jones, W.D. Batchelor, Irmak, K.J. Boote and J.O. Paz. 2006. Artificial neural network model as a data analysis tool in precision farming. Transactions of the ASABE 49(6):2027-2037.
  195. Irmak, A., J. Jones, W. Batchelor, Irmak, J. Paz and K. Boote. 2006. Analysis of spatial yield variability using a combined crop model-empirical approach. Transactions of the ASABE 49(3):811-818.
  196. Irmak, S., J.O. Payero, D.L. Martin, A. Irmak and T.A. Howell. 2006. Sensitivity analyses and sensitivity coefficients of the standardized ASCE-Penman-Monteith equation to climate variables. Irrigation and Drainage Engineering 132(6):564-578.
  197. Payero, J.O., and Irmak. 2006. Variable upper and lower crop water stress index (CWSI) baselines for corn and soybean. Irrigation Science 25:21-32.
  198. Payero, J.O., D.D. Tarkalson and Irmak. 2006. Use of Time-Domain Reflectometry for continuous monitoring of nitrate in soil and water. Applied Engineering in Agriculture 22(5):689-700.
  199. Xinhua, J., M.D. Dukes, J.M. Jacobs and Irmak. 2006. Weighing lysimeters for evapotranspiration research in a humid environment. Transactions of the ASABE 49(2):401-412.
  200. Payero, J.O., S.R. Melvin, Irmak and D.D. Tarkalson. 2006. Yield response of corn to deficit irrigation in a semi-arid environment. Agricultural Water Management 84:101-112.
  201. Payero, J.O., S.R. Melvin and Irmak. 2005. Response of soybean to deficit irrigation in the semi-arid environment of West-Central Nebraska. Transactions of the ASAE 48(6):2189-2203.
  202. Irmak, S., and A. Irmak. 2005. Performance of frequency-domain, capacitance, and psuedo-transit time-based soil water content probes in four coarse-textured soils. Applied Engineering in Agriculture 21(6):999-1008.
  203. Irmak, S. 2005. Closure on predicting daily net radiation using minimum climatological data. Irrigation and Drainage Engineering 4:389-390.
  204. Irmak, S., T.A. Howell, R.G. Allen, J.O. Payero and D.L. Martin. 2005. Standardized ASCE-Penman-Monteith: Impact of sum-of-hourly vs. 24-hr-time step computations at reference weather station sites. Transactions of the ASAE 48(3):1063-1077.
  205. Irmak, S., D.Z. Haman, A. Irmak, J.W. Jones, B. Tonkinson, D. Burch, T.H. Yeager and C. Larsen. 2005. Root-zone temperatures of odoratissimum grown in the MPBS and conventional systems: Measurement and analyses of temperature profiles and predicting root-zone temperatures. J. American Society of Horticultural Sciences 40(3):808-818.
  206. Irmak, S. Crop evapotranspiration and crop coefficients of Viburnum Odoratissimum (Ker-gawl). Applied Engineering in Agriculture 21(3):371-381.
  207. Irmak, S., D. Dukes and J.M. Jacobs. 2005. Using modified Bellani plate evaporation gauges to estimate short canopy reference evapotranspiration. J. Irrigation and Drainage Eng. 131(2):164-175.
  208. Irmak, S., D.Z. Haman, A. Irmak, J.W. Jones, K.L. Campbell and T.L. Crisman. 2004. Measurement and analyses of growth and stress parameters of Viburnum Odoratissimum (Ker-gawl.) grown in a MPBS. American Society of Horticultural Sciences, 39(6):1445-1455.
  209. Satti, S.R., J.M. Jacobs and Irmak. 2004. Agricultural water management in a humid region: sensitivity to climate, soil, and crop parameters. Agricultural Water Management 70:51-65.
  210. Irmak, S., R.G. Allen and E.B. Whitty. 2003. Daily grass and alfalfa-reference evapotranspiration estimates and alfalfa-to-grass evapotranspiration ratios in Florida. Irrigation and Drainage Engineering 129(5):360-370.
  211. Irmak, S., A. Irmak, J.W. Jones, T.A. Howell, J.M. Jacobs, R.G. Allen and G. Hoogenboom. 2003. Predicting daily net radiation using minimum climatological data. Irrigation and Drainage Engineering 129(4):256-269.
  212. Irmak, S., A. Irmak, R. Allen and J. Jones. 2003. Solar and net radiation-based equations to estimate reference evapotranspiration in humid climates. Irrigation and Drainage Engineering 129(5):336-347.
  213. Irmak, S., Z. Haman, A. Irmak, J. W. Jones, K. L. Campbell and T. H. Yeager. 2003. New irrigation-plant production system for water conservation in ornamental nurseries: Quantification and evaluation of irrigation, runoff, plant biomass, and irrigation efficiencies. Applied Engineering in Agriculture 19(6):651-655.
  214. Irmak, S. and D.Z. Haman. 2003. Evaluation of five methods for estimating Class "A" pan evaporation in a humid climate. HortTechnology 13(3):500-508.
  215. Irmak, S., A. Irmak and J.W. Jones. 2003. Predicting multiple layers of bare soil temperatures: A model evaluation and modifications for sandy soils. Soil and Crop Sci. Soc. of Florida 62:20-29.
  216. Irmak, S., D.Z. Haman and J.W. Jones. 2002. Evaluation of Class "A" Pan coefficients for estimating reference evapotranspiration in a humid location. Irrigation and Drainage Eng. 128(3):153-159.
  217. Irmak, A., W.D. Batchelor, J.W. Jones, Irmak, J.O. Paz, H. Beck and M. Engel. 2002. Relationship between plant available soil water and yield for explaining soybean yield variability. Applied Engineering in Agriculture 18(4):471-482.
  218. Irmak, S. and D.Z. Haman. 2001. Performance of the Watermark granular matrix sensor in sandy soils. Applied Engineering in Agriculture 17(6):787-795.
  219. Irmak, S.Z. Haman and A. Irmak. 2001. Dew point hygrometers for irrigation scheduling in fine-textured soils. Applied Engineering in Agriculture 17(1):17-25.
  220. Irmak, S., D.Z. Haman and T.H. Yeager. 2001. Seasonal irrigation water use efficiency of MPB System. Environmental Horticulture 19(1):4-10.
  221. Irmak, S., D.Z. Haman and R. Bastug. 2000. Determination of crop water stress index for irrigation timing and yield estimation of corn. Agronomy Journal 92(6):1221-1227.
  222. Irmak, A., J.W. Jones, C.D. Stanley, J.W. Hansen, Irmak and K.J. Boote. 1999. Some effects of an antitranspirant (Vapor GardTM) on tomato growth and yield. Soil and Crop Sci. Soc. FL 58:118-122.
  223. Haman, D.Z., Irmak, T.H. Yeager, R.C. Beeson, Jr., and G.W. Knox. 1998. MPB and funneled containers in container nursery production. Proc. Florida State Horticultural Society 111:39‑41.
  224. Bastug, R. and Irmak. 1996. Using soil matric potential and crop water stress index for irrigation management. Mediterranean University-Journal of Agriculture (9):241-255.
  225. Bastug, R. and Irmak. 1995. Measuring leaf water potential using thermocouple hygrometers and psychrometers. Mediterranean University-Journal of Agriculture (8):383‑394.
  226. Hakgoren, F., A. Irmak and Irmak. 1995. Cooling of greenhouses. Mediterranean University-Journal of Agriculture (8):238‑252.

Book Chapters

  1. Irmak, S., and M.S. Kukal. 2021. Evapotranspiration Processes in the Soil-Residue-Canopy System. In: Modeling Soil-Plant-Climate-Management Processes. D. Lynch (Managing Editor) and S. Wendroth and L. Ahuja, Co-Editors). ASA, SSSA, CSSA. Madison, WI (in press, invited).
  2. Mutiibwa, D., A. Kilic and Irmak. 2018. Identifying changes in trends of summer air temperatures of the USA High Plains. Book Chapter. In: Water Challenges of Urbanizing World. M. Glavan (Ed.). Chapter 9. pp. 145-161. InTech Publications. dx.doi.org/10.5772/intechopen.71788. London, UK (invited).
  3. Payero, J., and Irmak. 2011. Actual evapotranspiration, crop coefficient, and energy-balance components of surface-irrigated corn. In: Evapotranspiration: From Measurements to Agricultural and Environmental Applications. Chapter 4, INTECH Publisher, G.A. Gerosa (Ed.). ISBN 978-953-307-512-9, November 11, 2011. pp. 59-78 (invited).
  4. Irmak, S. Evapotranspiration. 2008. In: Encyclopedia of Ecology. Manuscript No. 270. Sven Erik Jorgensen & Brian D. Fath, (eds). Encyclopedia of Ecology, 1st Edition, Elsevier B.V., Oxford. pp. 1432-1439. Journal Series No. 1037 (invited).

Professional Society Conference Technical And Scientific Papers And Abstracts

  1. Kashyap, S. P., D. Heeren, W. Woldt, C. Neale, Irmak, Y. Shi, M. Maguire, S. Bhatti and J. Singh. 2021. High-frequency unmanned aircraft flights for crop canopy imaging during moisture-stress and subsequent irrigation. ASABE AIM (Abstract). July 11-14 (virtual).
  2. Mausbach, J., Irmak, M. Kukal, D. Sarangi, J. Lindquist and A. Jhala. 2020. Evapotranspiration of Palmer amaranth (Amaranthus palmeri) in corn, soybean, and fallow under subsurface drip and center-pivot irrigation systems. WSSA Annual Conference (Abstract). March 2-5, 2020. Hawaii.
  3. Brar, D., W. Kranz, D. Martin and Irmak. 2019. Energy conservation using variable frequency drives for center pivot irrigation systems. Proc. 31st Ann. Central Plains Irrig. Conf., Kearney, NE, Feb. 26-27, 2019.
  4. Barnes, E., N. Lawrence, S. Knezevic, O. Rodriguez, Irmak and A. Jhala. 2019. Response of white and yellow popcorn hybrids to pre- and post-emergence herbicides. 2019 WSSA Annual Meeting. February 11-14, 2019. New Orleans, LA.
  5. Barnes, E., Irmak, S. Knezevic, O. Rodriguez, N. Lawrence and A. Jhala. Response of white and yellow popcorn hybrids to Glyphosate, 2,4-D/Glyphosate, or Dicamba (oral). 2018. NCWSS Annual Meeting. December 3-6, 2018. Milwaukee, WI.
  6. Barnes, E., S. Knezevic, N. Lawrence, Irmak, O. Rodriguez and A. Jhala. 2018. Post-emergence control of Velvetleaf in popcorn (poster). 2018. December 3 -6, 2018. Milwaukee, WI.
  7. Bai, Y. Ge, B. Leavitt, J.A.Gamon, Y. Qi, T. Awada, G. Graef, S. Irmak, J.C. Schnable, D. Scoby and V. Stoerger. 2018. Capturing diurnal variation of phenotypic traits for breeding plots using UNL Field Phenotyping Facility (Abstract). December 10-14, 2018. AGU Fall Meeting. Washington, DC, USA.
  8. Naser, M., R. Ferguson, B. Krienke, Irmak, D. Rudnick, T. Shaver, C. Shapiro and K. Glewen. 2018. Can the integration of a crop sensor and crop model be used to determine timing and rate of nitrogen fertigation? Proc. Great Plains Soil Fertility Conference, March 6-7, Denver, CO.
  9. Kranz, B., D. Brar, Tsz Lo, Irmak and D. Martin. 2017. Energy conservation using variable-frequency drives for center pivot irrigation. Proc. Central Plains Irrigation Conference. pp. 155-166. February 21-22, 2017. Burlington, CO.
  10. Martin, D., W. Kranz, Irmak, D. Rudnick, C. Burr and S. Melvin. 2017. Pumping plant performance. Proc. Central Plains Irrigation Conference. pp. 167-187. February 21-22, 2017. Burlington, CO.
  11. Rudnick, D., Irmak, C. Ray, J. Schneekloth, M. Schipanski, I. Kisekka, A. Schlegel, J. Aguilar, D. Rogers, D. Mitchell, C. West, T. Marek, Q. Xue, W. Xu and D. Porter. 2017. Deficit irrigation management of corn in the High Plains: A Review. Proc. Central Plains Irrigation Conference. pp. 66-84. February 21-22, 2017. Burlington, CO.
  12. Sun, G., S. Sun, J. Xiao, P. Caldwell, D. Amatya, Irmak, P. Gowda, S. Panda, S. McNulty and Y. Zhang. 2016. Estimating watershed evapotranspiration across the United States using multiple methods. In Stringer, Christina E.; Krauss, Ken W.; Latimer, J.S., eds. Headwaters to estuaries: Advances in watershed science and management. Proc. 5th Interagency Conference on Research in the Watersheds. March 2-5, 2015, North Charleston, South Carolina. e-Gen. Tech. Rep. SRS-211. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station. p. 302.
  13. Sarangi, D., S.Z. Knezevic, J.L. Lindquist, Irmak and A.J. Jhala. 2015. Pollen-mediated gene flow from Glyphosate-resistant to susceptible Common Waterhemp under field conditions. (Abstract). North Central Weed Science Society (NCWSS) Annual Meeting. December 7-10, 2015. Indianapolis, IN.
  14. Sarangi, D., L.D. Sandell, S.Z. Knezevic, J.S. Aulakh, J.L. Lindquist, Irmak and A.J. Jhala. 2014. Glyphosate-resistant Common Waterhemp in Nebraska: confirmation and control in soybean. Proc. 69th Ann. Meeting of the North Central Weed Sci. Soc. Minneapolis, MN. Dec 1-4, 2014.
  15. Aegerter, C., J. Wang, C. Ge, A. Kessner, Sharma, L. Judd, B. Wardlow, J. You, M. Shulski, S. Irmak and A. Kilic. 2014. Modeling and Satellite Remote Sensing of the Meteorological Effects of Irrigation during the 2012 Central Plains Drought. 2014. American Geophysical Union (AGU) Annual Conference. December 15-19, San Francisco, USA (abstract).
  16. Eisenhauer, D., J Deck, A. Volkmer, Irmak, J. Gates, D. Martin and J. Gibson. 2014. Percolation of water beneath crop root zones of center-pivot irrigated tilled and no-till fields in south central Nebraska. ASABE Paper No. 141914240.
  17. Volkmer, A., J. Deck, D. Eisenhauer, Irmak, J. Gates, D. Martin and L.O. Odhiambo. 2014. Hydraulic conductivity land use coefficients for no-till and tilled row crops. ASABE Paper No. 141913882.
  18. Volkmer, A., D. Eisenhauer, J. Deck, Irmak, J. Gates, D. Martin and L. Odhiambo. 2014. Curve numbers of hydrologic soil Groups B and C for long-term no-till agriculture. ASABE Paper No. 141913816.
  19. Amatya, D., G. Sun, P. Gowda, J. de Jong, J. Nettles, S. Basu and Irmak. 2014. Evapotranspiration: Challenges in measurement and modeling from leaf to the landscape scale and beyond. Proc. ASABE International Evapotranspiration Symposium, Raleigh, NC, April 07-10, 2014.
  20. Ferguson, R., M. Schmer, T. Shaver, B. Wienhold, S. van Donk, Irmak, D. Rudnick, N. Ward, V. Jin, D. Francis, A. Bereuter and L. Hendrickson. 2013. Variable rate irrigation and nitrogen fertilization of maize across landscape positions. Proc. Int. Soc. of Precision Agric. (J. Stafford, Ed.) pp. 729‑736.
  21. McKinney, M.B., D.E. Eisenhauer, S. Irmak, J. E. Gilley, W.L. Kranz and D.L. Martin. 2012. Dynamics of depression storage during sprinkler irrigation and precipitation events. of the 2012 Annual ASABE International Conference. Dallas, TX, July 29-August 3, 2012.
  22. Safa, B., T. Arkebauer, A. Suyker and Irmak. 2012. Modeling carbon dioxide flux over a cropland using artificial neural networks. Proc. 30th Conference on Agricultural and Forest Meteorology; First Conference on Atmospheric Bio-geosciences. Am. Meteorological Society. May 30, 2012. Boston, MA.
  23. Ferguson, F., T. Shaver, N. Ward, Irmak, S. Van Donk, D. Rudnick, B. Wienhold, M. Schmer, V. Jin, D. Francis, V. Adamchuk and L. Hendrickson. 2012. Landscape influences on soil nitrogen supply, and water holding capacity for irrigated corn. Proc. Int. Soc. Precision Ag. July 15-18, Indianapolis, IN, USA.
  24. Irmak, S. Effective water management strategies to improve crop water productivity. Proc. 6th World Water Forum. March 12-16, 2012. Marseille, France.
  25. Zoubek, G., Irmak, J. Rees and B. VanDeWalle. 2012. Nebraska Agricultural Water Management Network Update. Proc. 24th Annual CPIC, Colby, KS. February 21-22, 2012. Colby, Kansas.
  26. Deck, J., D. Eisenhauer and Irmak. 2010. Infiltration and run-off under center pivots with no-till planting. Paper No. 9215. Proc. 5th Decennial Irrig. Conf. ASABE and Irrig. Assoc. December 5-8, Phoenix, AZ.
  27. Eisenhauer, D.E., J.H. Deck, Irmak, P. Jasa and D.L. Martin. 2010. Green and Ampt infiltration parameters under no-till center pivots. Paper No. 9245. Proc. 5th Decennial Irrigation Conference. ASABE and Irrigation Association. December 5-8, Phoenix, AZ.
  28. Eisenhauer, D.E., J.H. Deck and Irmak. 2010. Deep percolation under center pivots with no-till. Paper No. 9257. Proc. 5th Decennial Irrigation Conf. ASABE and Irrig. Assoc. December 5-8, Phoenix, AZ.
  29. Irmak, A., I. Ratcliffe, P. Ranade, Irmak, J. Kjaersgaard, B. Kamble, R. Choragudi, K. G. Hubbard, R. Singh, D. Mutiibwa and N. Healey. 2010. Seasonal Evapotranspiration Mapping Using Landsat Visible and Thermal Data with an Energy Balance Approach in Central Nebraska. Proc. Remote Sensing and Hydrology. Jackson Hole, Wyoming, USA, September 2010.
  30. Irmak, A., I. Ratcliffe, Irmak, P. Ranade, J. Kjaersgaard, B. Kamble, K. Hubbard and D. Mutiibwa. 2010. Growing season evapotranspiration with satellite remote sensing procedure. Am. Geophysical Union (AGU) Annual Int. Meeting. December 14-18. San Francisco, California, USA. (Abstract).
  31. Akasheh, O.Z., A. Irmak, Irmak, I. Ratcliffe, R. Singh, P. Ranade and P.H. Gowda. 2010. Comparison of evapotranspiration from two remote sensing-based surface energy models in south central Nebraska. Proc. Remote Sensing and Hydrology. Jackson Hole, WY, USA, Sept. 2010; IAHS Publ. 3XX, 2011.
  32. Irmak, A., I. Ratcliffe, P. Ranade, Irmak, J. Kjaersgaard, B. Kamble, R. Choragudi, K. G. Hubbard, R. Singh, D. Mutiibwa and N. Healey. 2010. Seasonal Evapotranspiration Mapping Using Landsat Visible and Thermal Data with an Energy Balance Approach in Central Nebraska. Proc. Remote Sensing and Hydrology. Jackson Hole, Wyoming, USA, September 2010; IAHS Publ. 3XX, 2011.
  33. Ferguson, R., G. Slater, D. Krull and Irmak. 2009. Nitrate leaching potential from slow and controlled release nitrogen fertilizer application to irrigated corn. Proc. North Central Extension-Industry Soil Fertility Conference. November 12-13, Des Moines, IA.
  34. Torrion, J., T.D. Setiyono, J.E. Specht, K.G. Cassman, R.B. Ferguson, D.T. Walters and Irmak. 2009. Predicting soybean root growth by water depletion in the soil profile (abstract). 2009 ASA Annual Conference, November 1-5, 2009, Pittsburg, PA.
  35. Hay, C.H., and Irmak. 2009. Bayesian model averaging for accounting for model selection uncertainty with an application for predicting net radiation. ASABE paper No. 09-. 2009 ASABE Annual International Meeting, Grand Sierra Resort and Casino, Reno, NV, June 21-24, 2009.
  36. Hay, C., and Irmak. 2009. Recursive and explicit combination methods for calculating reference evapotranspiration. Proc. 2009 Environ. and Water Res. Cong. May 12-16, 2009. Kansas City, KS.
  37. Shock, C., Irmak, B. Sanden, L. Lima and K. Taylor. 2008. Grower adoption of Granular Matrix Sensors. American Society of Agronomy International Meeting. Soil and Water Management and Conservation Division. October 5-9, 2008. Houston, TX. Technical abstract (Abstract ID#: 45774).
  38. Van Donk, S., D.L. Martin, Irmak, S. Melvin and J. Petersen. 2008. Effect of crop residue on soil water content and yield of sprinkler-irrigated corn. ASABE Paper No. 08-4724. 2008 ASABE Annual International Meeting, Rhode Island, Providence, June 29-July 2, 2008.
  39. Hay, C.H., and Irmak. 2008. Surface energy balance and surface coefficients of a corn field during non-growing periods. Proc. 2008 World EWRI Congress. May 12-16, 2008. Honolulu, Hawaii.
  40. Irmak, S., D. Mutiibwa, A. Irmak, T.J. Arkebauer, A. Weiss, D.L. Martin and D.E. Eisenhauer. 2007. Scaling up of leaf stomatal resistance to canopy resistance. ASABE Paper No. 07-2297. 2007 ASABE Annual International Meeting, Minneapolis, MN, 17-20 June 2007.
  41. Lagos, L.O., D.L. Martin, Irmak and X. Zhou. 2007. Evaluating evapotranspiration with SWAT, a distributed watershed model, and the FAO56 Penman-Monteith method. ASABE Paper No. 07-2294. 2007 ASABE Annual International Meeting, Minneapolis, MN, 17-20 June 2007.
  42. Yang, H., K. Cassman, Irmak and D. Walters. 2007. Corn water use efficiency with deficit irrigation in high-yielding settings. Proc. 2007 ASA Ann. Int. Meeting. November 4-8, 2007. New Orleans, LO.
  43. Irmak, S., G.L. Zoubek, J.M. Rees and B.S. VanDeWalle. 2007. Nebraska Agricultural Water Management Demonstration Network. of the NACAA AM/PIC Conference. Grand Rapids, MI.
  44. Singh, R.K., A. Irmak, Irmak and D.L. Martin. 2007. The satellite-remote sensing-based estimation of land surface evapotranspiration in Great Plains. Proc. of the ASCE-EWRI Word Environmental Water Resources Congress. May 15-19, 2007. Tampa, FL.
  45. Ferguson, R.B., and Irmak. 2006. In-season nitrogen management for subsurface drip-irrigated corn in south central Nebraska. Proc. 36th North Central Extension-Industry Soil Fertility Conference. November 7-8, Des Moines, IA.
  46. Ferguson, R.B., and Irmak. 2006. In-season nitrogen management of sub-surface drip irrigated corn. In ASA-CSSA-SSSA 2006 International Meetings. Indianapolis, IN.
  47. Payero, J.O., D.D. Tarkalson and Irmak. 2006. Yield response of corn to timing of a limited seasonal irrigation depth (150 mm) with subsurface drip irrigation. Proc. of the ASCE-EWRI World Environmental and Water Resources Congress. May 21-25, 2006. Qwest Center, Omaha, NE.
  48. Payero, J.O., D.D. Tarkalson and Irmak. 2006. Corn yield response to different irrigation depths with subsurface drip irrigation. Proc. ASCE-EWRI World Environmental and Water Resources Congress. May 21-25, 2006. Qwest Center, Omaha, NE.
  49. Haman D.Z., C. Cornejo, T.H. Yeager and Irmak. 2005. Use of MPBS for Container Production of Perennial Plants. ASAE Annual International Meeting. Paper No: 054058. American Society of Agricultural Engineers, 2950 Niles Road, Saint Joseph, MI 49085-9659 USA.
  50. Dukes, M.D., Irmak and J.M. Jacobs. 2004. An automatic system for recording evaporation from ETgages. ASAE Annual International Meeting, Fairmont Chateau Laurier, The Westin, Government Centre, Ottawa, Ontario, Canada, 1-4 August 2004, ASAE Paper No. 042191. St. Joseph, MI.
  51. Irmak, S., and D.Z. Haman. 2001. Evaluation of the FAO56-Penman-Monteith equation for humid climates. ASAE Paper No. 01-2096. ASAE, St. Joseph, MI.
  52. Irmak, S., and D.Z. Haman. 2000. Performance of the Watermark Granular Matrix Sensor in sandy soils. ASAE Paper No. 00-2037. Amer. Soc. Agric. Engr., St. Joseph, MI.
  53. Irmak, S., D.Z. Haman, A.G. Smajstrla and R. Bastug. 1999. Measurement of soil water potential using soil hygrometer for irrigation timing of corn. ASAE Paper No. 99‑2236. St. Joseph, MI.
  54. Irmak, S., D.Z. Haman and A.G. Smajstrla. 1999. Continuous water content measurements with time‑domain reflectometry for sandy soils. Soil and Crop Science Soc. Florida 58:77-81.
  55. Haman, D.Z., T.H. Yeager and Irmak. 1999. MPB System for increased efficiency of irrigation in ornamental plant production. The Irrigation Association Conference. p. 223‑228. Orlando, FL
  56. Irmak, A., J.W. Jones, J.W. Hansen, Irmak and C.D. Stanley. 1998. The effects of antitranspirant on tomato growth and yield. Annual International Agronomy Meetings, Baltimore, 18‑22 Oct. (abstract).
  57. Haman, D.Z., T.H. Yeager, Irmak and C. Larsen. 1998. Container plant production in MPBS. SNA Research Conference, Atlanta, GA 43:113‑116.

Refereed Extension/Education Publications

  1. Irmak, S. 2019. Perspectives and considerations for soil moisture sensing technologies and soil water content- and soil matric potential-based irrigation trigger values. Extension NebGuide 3045. 8 pp.
  2. Irmak, S. 2019. Soil-water potential and soil-water content concepts and measurement methods. Extension Circular EC3046. 18 pp.
  3. Barnes, Knezevic, N. Lawrence, S. Irmak, O. Rodriguez and A. Jhala. September 9, 2019. Pre-emergence herbicide delays the critical time of weed removal in Nebraska popcorn. cropwatch.unl.edu/2019/pre-emergence-herbicide-delays-critical-time-weed-removal-nebraska-popcorn.
  4. Specht, J., T. Hoegemeyer, G. Graef, L. Ruff, J. Torrion, P. Grassini, J. Edreira, F.A. Tenorio, B. Farmaha, J. Miller, T. Shaver, C. Wortman, C. Shapiro, B. Krienke, S. Knezevic, A. Jhala, G. Krueger, R. Werle, C. Procter, H. Blanco, R. Elmore, Irmak, R. Wright, T. Hunt, L. Giesler, T. Ziems, M. Shulski, A. Dutcher, S. Cooper, K. Glewen, N. Mueller, J. Rees and L. Thompson. 2019. Nebraska Soybean and Corn Pocket Field Guide. Extension Bulletin. pp. 378. https://nebraskasoybeans.org/wp-content/uploads/2019/06/58960-25_NE_SoybeanGuide_NoCrops-1.pdf.
  5. Krienke, B., R. Ferguson, Irmak, D. Rudnick, C. Shapiro, T. Shaver, K. Gleven, B. Maharjan, C. Wortmann and M. Naser. 2019. Profit and nitrogen use efficiency gain using sensor-guided fertigation. Proc. of the Crop Production Clinics. https://cropwatch.unl.edu/cpc-proceedings-2019.
  6. Irmak, S. Change in climate variables and their impacts on agricultural productivity. Miller Journal. 109(1):52-55. http://www.millermagazine.com/issue_109/52/.
  7. Irmak, S. Subirrigation in agricultural fields. Extension Circular EC3038. 5 pp.
  8. Irmak, S. Long-term (1893-2012) changes in monthly, growing season and annual precipitation trends and magnitudes in central Nebraska. Extension Circular EC717. 12 pp.
  9. Kukal, M., and Irmak. 2018. Patterns and magnitudes of spatial and temporal changes in precipitation and aridity across 800 Great Plains Counties. Extension Circular EC3025. 17 pp.
  10. Lo, T.H., D. Rudnick, Y. Ge, D.M Heeren, Irmak, J.B. Barker, X. Qiao and T. Shaver. 2018. Ground-based thermal sensing for irrigation management. Extension NebGuide G2301. 7 pp.
  11. Martin, D., W. Kranz, T. Smith, Irmak, C. Burr and R. Yoder. 2018. Center pivot irrigation handbook. Extension Circular EC3017. 134 pp. http://extensionpublications.unl.edu/assets/pdf/ec3017.pdf.
  12. Krienke, B., A. Dutcher, R. Ferguson, Irmak, B. Maharjan, C. Wortmann and H. Yang. 2018. Consequences of fall-applied N. Nebraska Extension CropWatch. p. 1-4. https://cropwatch.unl.edu/2018/consequences-fall-applied-n. Issue: November 9, 2018.
  13. Irmak, S. Evapotranspiration basics and estimating crop evapotranspiration from reference evapotranspiration and crop-specific coefficients. Extension NebGuide G1994. 9 pp.
  14. Irmak, S. Simplified forms of deep percolation below the crop root zone estimation method for silt-loam soils. Extension Circular EC 3015. 7 pp.
  15. Irmak, S. Simplified forms of surface run-off estimation method for silt-loam soils. Extension Circular EC3016. 5 pp.
  16. Kukal, M., and Irmak. 2017. Spatial and temporal changes in grass-reference evapotranspiration across 800 US Great Plains counties from 1968 to 2013. Extension Circular EC3022. 11 pp.
  17. Van DeWalle, B., A. Nygren, C. Burr, G. Zoubek and Irmak. 2017. Agricultural water management guide. http://cropwatch.unl.edu/Agricultural_Water_Management_Guide/index.html.
  18. Rees, J., Specht, R. Elmore, L. Giesler, T. Hunt, S. Irmak, A. Jhala, R. Klein, N. Mueller, C. Shapiro, A. Vyhnalek and R. Wright. 2017. Planting soybean after soybean (Part 1): Planting considerations. Nebraska Extension, CropWatch. April 13, 2017. http://cropwatch.unl.edu/2017/planting-soybean-after-soybean-part-1-planting-considerations.
  19. Rees, J., Elmore, L. Giesler, T. Hunt, S. Irmak, A. Jhala, R. Klein, N. Mueller, C. Shapiro, J. Specht, A. Vyhnalek and R. Wright. 2017. Planting soybean after soybean (Part 2): In-season management considerations. CropWatch. April 13, 2017. http://cropwatch.unl.edu/2017/planting-soybean-after-soybean-part-2-season-management-considerations.
  20. Irmak, S., V. Sharma and K. Djaman. 2016. Winter wheat (Triticum aestivum) evapotranspiration (crop water use) and crop coefficients. Extension Circular EC 3005. 7 pp.
  21. Kukal, M., and S. Irmak. 2016. Observed space and time changes in air tem­peratures and daily temperature range for the counties in the U.S. Great Plains from 1968 to 2013. Extension Circular 12 pp.
  22. Rudnick, D.R., Irmak, A. Haghverdi, C.A. Burr, T.M. Shaver and T.J. Door. 2016. Soil-water sensors for irrigation management. Extension Circular EC3002. 9 pp.
  23. Irmak, S. 2016. Impacts of extreme heat stress and increased soil temperature on plant growth and development. UNL Extension, CropWatch. June 21, 2016. http://cropwatch.unl.edu/2016/impacts-extreme-heat-stress-and-increased-soil-temperature-plant-growth-and-development.
  24. Rees, J., T. Jackson-Ziems, T. Williams, T. Hoegemeyer, P. Grassini, R. Elmore, K. Glewen, Irmak and J. McMechan. 2016. Harvest 2016 -- When corn yields are below expectations. October 14, 2016. http://cropwatch.unl.edu/2016/harvest-2016-when-corn-yields-are-below-expectation.
  25. Sharma, V., and Irmak. 2015. Spatial and temporal corn evapotranspiration across Nebraska. Extension Circular EC2010. 9 pp.
  26. Irmak, S., and K. Djaman. 2015. Basic soil and water resources and irrigation engineering/agricultural water management and related terminology. Extension Circular 26 pp.
  27. Rudnick, D., and Irmak. 2015. E3A-IE.I: Irrigation Efficiency. Multi-state Extension publication series. No. B1264. UNL, MSU, UWY and Western SARE Sustainable Agriculture Research & Education. 28 pp.
  28. Kranz, W., C. Burr, B. Farmaha, P. Grassini, G. Hergert, Irmak, D. Martin, A. Nygren, C. Shapiro, T. Shaver and G. Zoubek. 2015. Irrigation and nitrogen management: User education/certification program. Extension Circular EC2008. 117 pp.
  29. Henning, J., S. Slack, M. Harrington, R. Shepard, B. Benham, T. Blewett, D. Devlin, V. Dupuis, C. Evensen, A. Fares, A. Gold, J. Hafer, Irmak, M. McFarland, S. Megdal, N. Mesner, T. Obreza, M. O'Neill, D. Osmond, D. Parker, P. Rees, P. Robinson, A. Shober, M. Silitonga, D. Swackhamer, D. LaDon Swann and R. Waskom. 2014. National Initiative on the Improvement of U.S. Water Security: Recommendations of the National Water Working Group, representing the Land Grant Institutions. Prepared by Association of Public and Land-Grant Universities (APLU); Extension Committee on Organization and Policy (ECOP); and Experiment Station Committee on Organization and Policy (ESCOP). August 2014. p. 1-20. http://www.aplu.org/document.doc?id=5505.
  30. Irmak, S., J. Payero, B. VanDeWalle, J. Rees, G. Zoubek, D. Martin, W. Kranz, D. Eisenhauer and D. Leininger. Principles and operational characteristics of Watermark granular matrix sensor to measure soil water status and its practical applications for irrigation management in various soil textures. Extension Circular EC783. 14 pp.
  31. Kranz, W.L., Irmak, D.L. Martin, T.M. Shaver and S. Van Donk. 2014. Variable rate application of irrigation water with center pivots. UNL Extension Circular EC2000.
  32. Irmak, S. 2014. Plant growth and yield as affected by wet soil conditions due to flooding or over-irrigation. Extension NebGuide G1904. 4 pp.
  33. Irmak, S. Potential (reference) and actual evapotranspiration trends across U.S. High Plains in relation to irrigation development and climate change. Extension Circular EC712.
  34. Irmak, S., L.O. Odhiambo, W.L. Kranz and D.E. Eisenhauer. 2014. Irrigation efficiency and uniformity, and crop water use efficiency. Extension Circular EC732. 8 pp.
  35. Martin, D.L., Irmak, W.L. Kranz, S. Van Donk, T. Smith and J. Shanahan. 2014. Crop water use. Crop Insight. 24(8):1-3. Pioneer-DuPont Agronomy Sciences.
  36. Martin, D.L., Irmak, W.L. Kranz, S. van Donk, T. Smith and J. Shanahan. 2014. Measuring soil water content. Crop Insight. 24(7):1-4. Pioneer-DuPont Agronomy Sciences.
  37. Rees et al. 2014. Nebraska On-Farm Research Network: Grower's interactive guide to on-farm research. UNL Extension publication (http://viewer.zmags.com/publication/4efd82ad#/4efd82ad/14).
  38. Martin, D.L., T. Smith, L. Kranz, S. Irmak, S. van Donk and J. Shanahan. 2014. Soil water management. Crop Insight. 24(6):1-4. Pioneer-DuPont Agronomy Sciences.
  39. Irmak, S., and D. Rudnick. 2014. Corn irrigation management under water-limiting conditions. Extension Circular EC2007.
  40. Irmak, S., and D.R. Rudnick. 2014. Corn soil-water extraction and effective rooting depth in a silt-loam soil. Extension NebGuide G2245.
  41. Irmak, S., and V. Sharma. 2014. Spatial and temporal variability of precipitation across Nebraska. Extension Circular EC2002.
  42. Irmak, S., and V. Sharma. 2014. Monthly, seasonal and annual spatial and temporal variability of reference (potential) evapotranspiration across Nebraska. Extension Circular EC2003.
  43. Irmak, S. Long-term (1893-2012) changes in air temperature, relative humidity and vapor pressure deficit (atmospheric evaporative demand) in central Nebraska. Extension Circular EC716.
  44. Skaggs, K.E., and Irmak. 2013. Climate change impact on air temperature, daily temperature range, growing degree days and spring and fall frost days in Nebraska. Extension Circular EC715.
  45. Grassini, P., H. Yang, Irmak, J.M. Rees, C. Burr and K.G. Cassman. 2012. Yield gaps and input-use efficiency of high-yield irrigated corn in Nebraska. Extension Circular EC106.
  46. Grassini, P., H. Yang, Irmak, J.M. Rees and K.G. Cassman. 2012. Evaluation of water productivity and irrigation efficiency in Nebraska corn production. Extension Circular EC105.
  47. Irmak, S., and K.E. Skaggs. 2011. Variability of reference evapotranspiration across Nebraska. Extension Circular EC733.
  48. Hoffman, G.J., Irmak, W.L. Kranz, C.D. Yonts, D.L. Martin and S. Van Donk. 2010. Water quality criteria for irrigation. Extension Circular EC782.
  49. Irmak, S. Magnitude and trends of reference evapotranspiration rates in south central Nebraska: Daily, monthly, growing season total, and annual total. Extension Circular EC765.
  50. Kranz, W.L, Irmak, S. Van Donk, C.D. Yonts and D.L. Martin. 2008. Irrigation management for corn. Extension NebGuide G1850.
  51. Kranz, W.L., D.L. Martin, Irmak, S. Van Donk and C.D. Yonts. 2008. Minimum center pivot design capacities in Nebraska. Extension NebGuide G1851.
  52. Irmak, S. Drip irrigation design and management considerations for windbreaks. Extension NebGuide G07-525.
  53. Irmak, S., R. Hay, B.E. Anderson, W.L. Kranz and C.D. Yonts. 2007. Irrigation management and crop characteristics of alfalfa. Extension NebGuide G07-826.
  54. Kranz, W.L., Irmak, D. L. Martin and C.D. Yonts. 2007. Flow control devices for center pivot irrigation systems. Extension NebGuide G888.
  55. Kranz, W.L., Irmak, D.L. Martin and C.D. Yonts. 2007. Converting center pivot sprinkler packages: System considerations. Extension NebGuide G1124.
  56. Ten easy ways to boost profit $20/acre. Extension Circular EC196.
  57. Payero, J.O., C.D. Yonts, Irmak and D.D. Tarkalson. 2005. Subsurface drip irrigation: Advantages and disadvantages. Extension Circular EC776.
  58. Irmak, S., J.O. Payero and D.L. Martin. 2005. Modified atmometers (ETgage) for irrigation management. Extension NebGuide, G05-1579.
  59. Irmak, S. and D.Z. Haman. 2003. Evapotranspiration: Reference or potential? Institute of Food and Agricultural Sciences, IFAS, Univ. Florida. Extension Publication No: ABE343-AE256.

Smart Phone Apps Development

  1. CropWater App. 2010 (lead author). The CropWater App was developed for iPhone and iPad provides an easy way to estimate soil water status based on Watermark soil matric potential sensors installed at soil depths of 1, 2 and 3 feet. With these sensor readings, the app will estimate the crop water used as well as what available soil water is remaining in the profile for typical Nebraska soils. The user can also see historic sensor readings and graph the data. https://itunes.apple.com/us/app/crop-water/id557926049?mt=8.
  2. CornSoyWater App. 2015 (co-author). This web-based and mobile app helps irrigators determine in real-time the available soil-water in a field and determines when to irrigate. Using real-time weather data and field-specific crop information provided by the user, the app uses simulation to track (from planting to current date) crop water use, water inputs from rainfall and irrigation, soil-water to the maximum rooting depth and crop water stress. http://hprcc-agron0.unl.edu/cornsoywater/.

Refereed Extension/Education And Outreach Articles/Newsletters/ Popular Magazine Articles

  1. Irmak, S. Using and Conserving Water: The basics of a practice as old as farming itself. CornsTalk. Aril 2020. https://necornstalk.com/using-and-conserving-water/.
  2. Irmak, S. Listen to the land. Progressive Farmer. February 2019. p. 20-23.
  3. Irmak, S., and M.S. Kukal. 2019. UNL researchers: Gap growing between irrigated, rain-fed crop yields. Kearney Hub. August 17, 2019. https://www.kearneyhub.com/news/state/unl-researchers-gap-growing-between-irrigated-rain-fed-crop-yields/article_e0738ac0-c09b-11e9-a709-72f1e3d18f3.html.
  4. Irmak, S. 2019. Roadmap for agricultural productivity. https://www.aa.com.tr/tr/ekonomi/tarimsal-uretkenlik-icin-yol-haritasi-onerisi/1368994. Anadolu Agency News; Turkiye Newspaper and World Newspaper. January 19, 2019.
  5. Irmak, S., and M. Kukal. 2018. Featuring 2018-Nebraska's Year in Review: Excellence in the Physical Sciences. https://news.unl.edu/newsrooms/today/article/2018-nebraskas-year-in-review/.
  6. Irmak, S. and M. Kukal. 2018. Climate change: Longer growing season, more heat - 115 years of data. AgFax. July 2, 2018. https://agfax.com/2018/07/02/climate-change-longer-growing-season-more-heat-115-years-of-data/.
  7. Irmak, S., and M.S. Kukal. June 19, 2018. 115 years of data reveal longer U.S. growing season, temp trends. The Voice News. p. B5.
  8. Irmak, S., and M.S. Kukal. June 29, 2018. 115 years of data reveal longer U.S. growing season, temp trends. https://news.unl.edu/newsrooms/today/article/115-years-of-data-reveal-longer-us-growing-season-temp-trends/.
  9. Irmak, S., and M. Kukal. March 22, 2018. Climate effects on crop yields can vary locally, across crops. unl.edu/newsrooms/today/article/study-climate-effects-on-ag-yields-vary-by-location-crop/.
  10. Krienke, B., R. Ferguson, Irmak, D. Rudnick, T. Shaver, C. Shapiro, K. Glewen and M. Naser. 2018. Feasibility of sensor-based nitrogen fertigation management in corn. CropWatch. January 8, 2018.
  11. Rudnick, D., J. Chávez, J. Aguilar, Irmak, J. Bordovsky, and C. Burr. 2017. Advances in irrigation technology. Colorado Water. November-December 2017. p. 29-32.
  12. Irmak, S. 2017. Monitoring every drop: Technology, coupled with education, helps to conserve irrigation water. UNL-IANR Strategic Discussions for Nebraska. Vol. 5, August 2017. p. 98-100.
  13. Irmak, S. Retaking the Field. The Case for a Surge in Agricultural Research: Knowledge Transfer: Helping Farmers Save Enough Water to Double Nebraska's Largest Lake. Supporters of Agricultural Research (SoAR) Foundation. p. 24.
  14. Irmak, S. Impacts of extreme heat stress and increased soil temperature on plant growth and development. CropWatch-UNL Extension. June 24, 2016.
  15. Irmak, S. A. Yong and N. Umphlett. 2015. Heavy rainfall events usually not ideal for groundwater recharge. Ed. T. Harris. Nebraska Farmer. July 16, 2015.
  16. Irmak, S. Building more efficient irrigation systems farm by farm. UNL-IANR Strategic Discussions for Nebraska. Vol. 5, August 2014. p. 54.
  17. Irmak, S. A Network that works for irrigators. Prairie Farmer. February 27, 2014.
  18. Irmak, S. UNL Research and Extension help agricultural producers manage a changing climate. UNL-IANR Strategic Discussions for Nebraska. Vol. 3, 2012.
  19. Irmak, S. Conservation agriculture is a means to sustainable agriculture. Conservation Agriculture Systems Innovation. June 22, 2012. California.
  20. Irmak, S. UNL research and Extension help agricultural producers manage a changing climate. UNL-IANR Strategic Discussions for NE: Opportunities for NE Food Scarcity. Vol. 3 (Aug. 2012), pp. 44-45.
  21. Irmak, S. 'Water' We know about water? Cornstalk-Nebraska Corn Board. May 2010.
  22. Torrion, J., T. Setiyono, J. Specht, K. Cassman, Irmak, K. Hubbard, and M. Shulski. SoyWater: An irrigation decision aid for Nebraska soybean producers. Crop Watch, April 2010.
  23. Irmak, S. Changing the face of irrigation. Hastings Tribune. March 2010. pp. 3-6.
  24. Irmak, S. Cut back on water. Nebraska Farmer. December 2009.
  25. Irmak, S. Dueling pivots. Nebraska Farmer. December 2009.
  26. Irmak, S. Too much water can reduce yields. Nebraska Farmer. IE8, November 2009.
  27. Irmak, S. Saving energy and water can be easy with soil moisture sensor technology. Corn and Soybean Digest. April 2009. pp. 51&54.
  28. Irmak, S. "Precision watering." Nebraska Farmer. December 2008.
  29. Irmak, S. "Network saves big on water." Nebraska Farmer. December 2008.
  30. Irmak, S., G. Zoubek, and N. Klocke. Farming with less water. The Furrow Magazine. Summer 2008.
  31. Irmak, S. Nighttime impacts crop yields. The Furrow Magazine. Spring 2008.
  32. Irmak, S., and K. Cassman. Corn producers can raise yields while reducing water use. Cornstalk: A publication of the Nebraska Corn Board. Winter (November-December) 2007.
  33. Irmak, S. Harvest more bushels per gallon irrigated. Irrigation View. November 2007.
  34. Irmak, S. Deficit irrigation. Successful Farming, October 2007.
  35. G., and S. Irmak. Agricultural water management. Acreage and Small Farm Insight, June 2007.
  36. Irmak, S. On-site evapotranspiration measurement saves water, money. NE Farmer. Jan. 2007:7.
  37. Irmak, S. Center pivot set up to study crop water stress. Nebraska Farmer. April 2006:22.
  38. Leininger, D., and Irmak. 2006. WATER-TIP update. UBBNRD, Blueprint Newsletter. July 2006:8.
  39. Leininger, D., and Irmak. Nebraska Agricultural Water Management Demonstration Network. Upper Big Blue Natural Resources District, Blueprint Newsletter. April 2006:8.
  40. Leininger, D., and Irmak. WATER-TIP Project. UBBNRD, Blueprint Newsletter. January 2006:6.
  41. Irmak, S. Water management with subsurface drip irrigation. Midwest Messenger/Bullseye. August
  42. Haman, D.Z., Irmak and T.H. Yeager. 2002. A new production system for container plants may decrease the time it takes to grow a plant and use less water. Am. Nurseryman. 10(1):54-56.
  43. Irmak, S. New system to save water for container-grown nursery plants. Gator Engineering. University of Florida, Spring 2001:9-10.

Publication Statistics, Citations and Downloads And H Index i10 Index

Irmak, Suat, h index = 49; i10 Index = 148. A total of 51,461 downloads with 4,844 metadata page hits by 2,900 national and international institutions in 177 countries with 1,519 referrers (http://readership.works.bepress.com/) for only 72 of my refereed journal articles (out of 220) listed in the Digital Commons with 8,402 citations. These data cover the period only from 2008 to July 2021.

Awards/Honors/Recognition

National/International Awards/Recognition (Major Awards Are Capitalized)

  1. "ASABE ADS/HANCOR SOIL AND WATER ENGINEERING AWARD." Honors and recognizes a member of ASABE who has made significant contributions to the advancement of soil and water engineering in teaching, research, planning, design, construction, management or development of materials. These contributions include in the form of published literature, notable performance, or special actions which have served to advance the science of soil and water engineering. July 17, 2021 (virtual).
  2. "ASABE NETAFIM AWARD FOR ADVANCEMENTS IN MICROIRRIGATION." Honors and recognizes an ASABE member who is providing excellence in research, development, extension, education or industry who has made significant contributions in the ability to utilize and adapt microirrigation technology at an appropriate scale for any given level of production technology. The award recognizes engineering excellence in the design, development, evaluation, operation, or management of microirrigation systems and/or efforts that increase the adoption of this efficient irrigation method. July 17, 2021(virtual).
  3. "2021 ASABE EDUCATIONAL BLUE RIBBON AWARD" for the article "Long-term (1893-2012) Changes in Monthly, Growing Season, and Annual Precipitation Trends and Magnitudes." July 17, 2021 (virtual).
  4. "2021 ASABE STANDARDS DEVELOPMENT AWARD" (Revision). ANSI/ASAE S436.2 JUN2020, Field Test Procedure for Determining Irrigation Water Distribution Uniformity of Center Pivot and Lateral Move Systems. July 17, 2021 (virtual).
  5. "2021 ASABE STANDARDS DEVELOPMENT AWARD" (New Standard). ANSI/ASABE S627 NOV2020, Weather-Based Landscape Irrigation Control Systems. July 17, 2021 (virtual).
  6. "FELLOW OF THE AMERICAN SOCIETY OF AGRICULTURAL AND BIOLOGICAL ENGINEERS (ASABE)." ASABE's highest honor and is awarded to a member of unusual professional distinction, with outstanding and extraordinary qualifications and experience in the discipline. Irmak is honored for his global impact in advancing the agricultural science, engineering and education in irrigation engineering, evapotranspiration, and surface energy balance measurements and modeling, climate change impact on agricultural productivity and water resources, understanding crop physiology, biophysics vs environment interactions. July 14, 2020.
  7. "2019 AMERICAN SOCIETY OF AGRONOMY EXCELLENCE FOR EXTENSION EDUCATION MATERIALS IN EXTENSION EDUCATION COMMUNITY AWARD" in the category of Digital Communications. November 13, 2019. San Antonio, TX.
  8. "2019 ASABE STANDARD DEVELOPMENT AWARD" for the Committee STC-01-ANSI/ASABE S632-1-Precision Agriculture Irrigation Language: Core Concepts, Processes, and Objects, and ANSI/ASABE S632-3- Precision Agriculture Irrigation Language: Irrigation System Operations. July 8, 2019. Boston, MA.
  9. "2019 UNIVERSITIES COUNCIL ON WATER RESOURCES EDUCATION AND PUBLIC SERVICE AWARD" for the North Central Region Water Network. June 4, 2019.
  10. "Among 10 Most Downloaded Articles in Ad Hoc Networks Journal" for the article "Internet of Underground Things in Precision Agriculture: Architecture and Technology Aspect." February 1, 2019.
  11. "2018 ASABE EDUCATIONAL BLUE RIBBON AWARD" for the article "Evapotranspiration (ET) basics and estimating crop ET from reference ET and crop specific coefficients." July 30, 2018. Detroit, MI.
  12. "2018 ASABE EDUCATIONAL BLUE RIBBON AWARD" for the refereed article "Simplified forms of deep percolation estimation method below the crop root zone for silt-loam soils." July 30, 2018. Detroit, MI.
  13. "2018 ASABE EDUCATIONAL BLUE RIBBON AWARD" for the refereed article "Simplified forms of surface runoff estimation method for siltloam soils." July 30, 2018. Detroit, MI.
  14. "2018 ASABE EDUCATIONAL BLUE RIBBON AWARD" for Nebraska Agricultural Water Management Network (NAWMN) Educational Website. July 30, 2018. Detroit, MI.
  15. "GLOBAL WATER SECURITY OF AGRICULTURE AND NATURAL RESOURCES CONFERENCE CERTIFICATE OF APPRECIATION" Presented by the ASABE and Indian Society of Agricultural Engineers for contributions as a Committee Co-Chair. October 3-6, Hyderabad, India.
  16. "One of the Most Popular Authors in the Civil and Environmental Engineering Commons." Of the 30,316 authors in the US, my scientific papers received some of the highest downloads. January 5, 2018.
  17. "2017 USDA-NIFA NATIONAL WATER & ENERGY CONSERVATION AWARD" for the USDA-NIFA Multistate Project W-3128 (Scaling Microirrigation Technologies to Address the Global Water Challenge). The award honors a significant achievement in the conservation of water and energy relating to irrigation procedures, equipment, methods and techniques. November 9, 2017. Orlando, FL.
  18. "2017 ASABE EDUCATIONAL AIDS BLUE RIBBON AWARD" presented by the American Society of Agricultural and Biological Engineers (ASABE) for the refereed publication "Observed space and time changes in air temperatures and daily temperature range for the counties in the US Great Plains from 1968 to 2013." July 17, 2017. Spokane, WA.
  19. "2017 ASABE STANDARDS DEVELOPMENT AWARD" for the standard "ANSI/ASABE S626 SEP2016, Landscape Irrigation System Uniformity and Application Rate Testing" by the ASABE NRES-246 Turf and Landscape Committee. July 17, 2017. Spokane, WA.
  20. "2017 BEST PAPER AWARD" in the Journal of Irrigation and Drainage Engineering for the refereed journal article "Inter-annual variation in long-term center pivot-irrigated maize evapotranspiration (ET) and various water productivity response indices: Part I. Grain yield, actual and basal ET, irrigation-yield production functions, ET-yield production functions, and yield response factors." Presented by the Irrigation and Drainage Council of the American Society of Civil Engineers (ASCE) and Environmental and Water Resources Institute (EWRI), Sacramento, CA. May 23, 2017.
  21. "2017 BEST PAPER AWARD" in the J. Irrigation and Drainage Engineering for the refereed journal article "Inter-annual variation in long-term center pivot-irrigated maize evapotranspiration (ET) and various water productivity response indices: Part II. Irrigation water use efficiency (IWUE), crop WUE, evapotranspiration WUE, irrigation-evapotranspiration use efficiency, and precipitation use efficiency." Presented by the Irrigation and Drainage Council of the ASCE-EWRI, Sacramento, CA. May 23, 2017.
  22. "2016 ASABE EDUCATIONAL AIDS BLUE RIBBON AWARD" presented by the Am. Soc. Agric. and Biological Engineers (ASABE) for the refereed publication "Basic soil and water resources and irrigation engineering/agricultural water management and related terminology." July 18, 2016. Orlando, FL.
  23. Nominated for the "NATIONAL ACADEMY OF SCIENCES PRIZE IN FOOD AND AGRICULTURAL SCIENCES" by UNL Chancellor Ronnie Green. September 30, 2016.
  24. "2016 ASABE EDUCATIONAL AIDS BLUE RIBBON AWARD" presented by the American Society of Agricultural and Biological Engineers (ASABE) for the refereed publication "Spatial and temporal corn evapotranspiration across Nebraska." July 18, 2016. Orlando, FL.
  25. "2016 BEST PAPER AWARD" in the Journal of Irrigation and Drainage Engineering for the refereed journal article "Impact of nitrogen fertilizer on maize evapotranspiration crop coefficients under fully irrigated, limited irrigated and rainfed settings." Presented by the Irrigation and Drainage Council of the ASCE-EWRI, West Palm Beach, FL. May 25, 2016.
  26. "IRRIGATION ASSOCIATION PARTNER OF THE YEAR AWARD" that honors a person or group making exceptional contributions or distinctive accomplishments to irrigation. The award was presented for the Center Pivot Irrigation Program that was established and executed in partnership between UNL Extension, NE DNR and NET. November 12, 2015. Long Beach, CA.
  27. "USDA-NIFA NATIONAL INNOVATIVE PROGRAMS AND PARTNERSHIP AWARD" (UNL's first USDA-NIFA Partnership award) for the Nebraska Agricultural Water Management Network (NAWMN) for its groundbreaking water management work and contributions in advancing agricultural science. The network has transferred high-quality research and data on soil water status and crop-water use measurements to farmers and their advisers; fostered adoption of new or newer irrigation water-management technologies to help farmers increase water-use efficiency, reduced energy consumption and protected agro-ecosystem services; developed new water, soil and crop management tools; and enhanced communication between growers, crop consultants, academics and state and federal agencies. The award was presented by the USDA Undersecretary Dr. Catherine Woteki and the USDA-NIFA Director Dr. Sonny Ramaswamy. October 23, 2014. Washington, D.C. The project impacts have also been presented to President Obama in a briefing by Dr. Ramaswamy.
  28. "NASA CERTIFICATE OF SERVICE APPRECIATION" in recognition of valuable contribution and outstanding support to the Advanced Information Systems Technology (AIST) Program and the NASA Earth Science Technology Office. Presented by Dr. George J. Komar, NASA Earth Science and Technology Office Associate Director and Program Manager. October 2014.
  29. "2014 ASABE JOHN DEERE GOLD MEDAL AWARD" presented by the American Society of Agricultural and Biological Engineers (ASABE) for achievements through engineering for improved manipulation, use and conservation of soil-water resources, and that has resulted in applications of a new concept, product, art or science that advanced the development of agriculture. Montreal, Canada. July 16, 2014 (youngest researcher/scientist to receive this award in ASABE history).
  30. "2014 ASABE HEERMANN SPRINKLER IRRIGATION AWARD" presented by the American Society of Agricultural and Biological Engineers (ASABE) in recognition of exceptional contributions in research, development, extension, and education that have made significant contributions to the enhancement of productivity and efficiency of sprinkler irrigated agriculture worldwide. Montreal, Canada. July 16, 2014 (youngest researcher/scientist to receive this award in ASABE history).
  31. "2014 ASABE SUPERIOR PAPER AWARD" presented by the American Society of Agricultural and Biological Engineers (ASABE) for the refereed journal article titled "Development and evaluation of ordinary least squares regression models for predicting irrigated and rainfed maize and soybean yields" published in Transactions of the ASABE. Montreal, Canada. July 16, 2014.
  32. "EXCELLENCE IN MULTISTATE RESEARCH AWARD" Presented by the Western Association of Agricultural Experiment Station Directors and U.S. Department of Agriculture's National Institute of Food and Agriculture (NIFA) and the Experiment Station Committee on Organization and Policy for the outstanding progress and impacts of the Regional Committee W2128 Microirrigation for Sustainable Water Use. The award was given to one committee out of 200 national committees. July 13, 2014, Lake Tahoe, NV.
  33. "2013 ASCE HONORABLE PAPER AWARD" presented by the Irrigation and Drainage Council of the American Society of Civil Engineers-Environmental and Water Resources Institute (ASCE-EWRI) for the refereed journal article titled "Dynamics of nocturnal, daytime, and sum-of-hourly evapotranspiration and other surface energy fluxes over non-stressed maize canopy" published in J. Irrigation and Drainage Engineering. Cincinnati, OH. May 19, 2013.
  34. "2013 ASABE EDUCATIONAL AIDS BLUE RIBBON AWARD" presented by the American Society of Agricultural and Biological Engineers (ASABE) for the publication titled "Evaluation of water productivity and irrigation efficiency in Nebraska corn production." July 21, 2013. Kansas City, MO.
  35. "NATIONAL FINALIST IN THE "SEARCH FOR EXCELLENCE IN THE CROP PRODUCTION CATEGORY OF NACAA AWARDS PROGRAM" for the Nebraska Agricultural Water Management Network (NAWMN) impact and accomplishments. NACAA 97th Annual Conference, July 15-19, 2012, SC.
  36. "OUTSTANDING SERVICE AS PAST CHAIR OF THE EVAPOTRANSPIRATION IN IRRIGATION AND HYDROLOGY COMMITTEE" presented by the American Society of Civil Engineers-Environmental and Water Resources Institute (ASCE-EWRI). May 23, 2012. Albuquerque, NM.
  37. "2011 ASABE EDUCATIONAL AIDS BLUE RIBBON AWARD" presented by the ASABE. This competition encourages agricultural engineers in industry and public service to strive for excellence in extension activities through the interchange of ideas on successful methods and techniques. It also promotes excellence in educational aids, which represent agricultural engineering and through the exchange of ideas and individual recognition, contributes to overall improvement in the use of educational aids. August 8, 2011. Louisville, KY.
  38. "2011 ASABE SUPERIOR PAPER AWARD" presented by the ASABE for the refereed journal article "Nebraska Agricultural Water Management Network: Integrating Research and Extension/Outreach" published in the Applied Engineering in Agriculture. August 8, 2011. Louisville, KY.
  39. "2011 HONORABLE PAPER AWARD" presented by the Irrigation and Drainage Council of the ASCE-EWRI for the refereed journal article "Actual and reference evaporative losses and surface coefficients of a maize field during non-growing (dormant) periods" published in J. Irrigation and Drainage Engineering. Palm Springs, CA, May 18, 2011.
  40. "2010 ASABE YOUNG EXTENSION PROFESSIONAL AWARD" recognizes outstanding success in motivating people to acquire knowledge, skills and understanding to improve agricultural operations. Irmak received the award for his exemplary leadership and outstanding contributions and impact to soil and water resources engineering through research, extension education, and outreach programs. Pittsburgh, PA. The first and only ASABE member to receive both New Holland Young Researcher and ASABE Young Extension Professional Award in ASABE history since its establishment in 1907.
  41. "2010 HONORABLE PAPER AWARD" presented by the Irrigation and Drainage Council of the ASCE-EWRI for the refereed journal article "Variability analyses of alfalfa-reference to grass-reference evapotranspiration ration in growing and dormant seasons" published in J. Irrigation and Drainage Engineering, ASCE. Providence, Rhode Island, May 18, 2010.
  42. "2010 HONORABLE PAPER AWARD" presented by the Irrigation and Drainage Council of the ASCE-EWRI for the refereed journal article "Reference and crop evapotranspiration in south central Nebraska: I. Comparison and analyses of grass and alfalfa-reference evapotranspiration" published in J. Irrigation and Drainage Engineering, ASCE. Providence, Rhode Island, May 18, 2010.
  43. "2010 HONORABLE PAPER AWARD" presented by the Irrigation and Drainage Council of the ASCE-EWRI for the refereed journal article "Reference and crop evapotranspiration in south central Nebraska: II. Measurement and estimation of actual evapotranspiration" published in J. Irrigation and Drainage Engineering, ASCE. Providence, Rhode Island, May 18, 2010.
  44. "EXCELLENCE IN AGRICULTURE AWARD" for Nebraska Agricultural Water Management Demonstration Network (NAWMDN). Presented at the 95th National Association of County Agricultural Agents (NACAA) Annual Meeting and Professional Development Conference, July 11-15, 2010. Tulsa, OK.
  45. "ENGINEER OF THE YEAR AWARD" presented by the Nebraska Section of the American Society of Agricultural and Biological Engineers (ASABE). The award is given to an ASABE member of the Nebraska Section to recognize outstanding achievement of an individual in the Agricultural and Biological Engineering field. October 2009. Hastings, NE.###
  46. "ASABE NATIONAL AWARD IN THE INNOVATIVE EXTENSION METHODS AND IMPACT ASSESSMENT" presented by American Society of Agricultural and Biological Engineers (ASABE) for the Nebraska Agricultural Water Management Demonstration Network (NAWMDN). June 2009, Reno, NV.
  47. "NATIONAL FINALIST AT THE EXTENSION PROGRAM POSTER COMPETITION" for the poster presentation "Nebraska Agricultural Water Management Demonstration Network." The National Association of County Agricultural Agents (NACAA) Annual Meeting, September 23, 2009. Portland, OR.
  48. "MOST POPULAR ENVIRONMENTAL AND WATER RESOURCES PAPER" for the refereed journal article "Actual and reference evaporative losses and surface coefficients of a maize field during non-growing (dormant) periods" published in the J. Irrigation and Drainage Eng. was selected by the American Society of Civil Engineers (ASCE)/Environmental and Water Resources Institute (EWRI), June 2009.
  49. "NEW HOLLAND YOUNG RESEARCHER AWARD" presented by the American Society of Agricultural and Biological Engineers (ASABE) for recognition of dedicated use of scientific methodology to seek out facts or principles significant to the agricultural and biological engineering profession. Rhode Island, Providence, July 2, 2008. The first and only ASABE member who received both New Holland Young Researcher and ASABE Young Extension Professional Award in ASABE history since its establishment in 1907.
  50. "2008 ASABE EDUCATIONAL AIDS COMPETITION BLUE RIBBON AWARD" in the Educational Publications Category for the publication "Drip Irrigation Design and Management Considerations for Windbreaks." UNL NebGuide G07-525. Rhode Island, Providence, July 2, 2008.
  51. "MOST POPULAR ENVIRONMENTAL AND WATER RESOURCES PAPER" for the refereed journal article "Application of SEBAL Model for Mapping Evapotranspiration and Estimating Surface Energy Fluxes in South Central Nebraska" in the J. Irrigation and Drainage Engineering, 134(3):273-285 was selected as a by the ASCE-/Environmental and Water Resources Institute (EWRI), June 2008.
  52. "2006 ASABE EDUCATIONAL AIDS COMPETITION BLUE RIBBON AWARD" in the Educational Publications Category for the publication "Using Modified Atmometers (ETgage) for Irrigation Management." Extension NebGuide, G05-1579. Portland, OR, 2006.
  53. "EXCELLENT SERVICE AWARD" presented by the Environmental and Water Resources Institute (EWRI) of the American Society of Civil Engineers (ASCE). The award was presented for recognition of excellent service to the 2006 ASCE-EWRI World Environmental and Water Resources Congress through hard work, support and organization of the "Irrigation and Drainage Engineering" track Omaha, NE, 2006.
  54. "BEST PAPER AWARD" in the J. Irrigation and Drainage Engineering for the refereed journal article titled "Solar and Net Radiation-Based Equations to Estimate Reference Evapotranspiration." Presented by the Irrigation and Drainage Council of the ASCE-. Anchorage, Alaska, 2005.
  55. Recognized by the Am. Soc. of Agricultural Engineers for being in the top 5% of the technical reviewers for showing exceptional quality in technical refereed manuscript review for the society journals, 2004.

Regional/Local Awards/Recognition (Major Awards Are Capitalized)

  1. "2020 NEBRASKA SECTION ASABE OUTSTANDING CONTRIBUTION TO AGRICULTURE AWARD." September 18, 2020. Lincoln, NE.
  2. "2020 UNL COLLEGE OF ENGINEERING HOLLING FAMILY DISTINGUISHED TEACHING, ADVISING AND MENTORING AWARD" in recognition of effectiveness as an adviser and mentor as well as effectiveness as a teacher. April 30, 2020. Lincoln, NE.
  3. "2020 GAMMA SIGMA DELTA-THE HONOR SOCIETY OF AGRICULTURE-THE EXTENSION AWARD OF MERIT AWARD." UNL-IANR. January 26, 2020. Lincoln, NE.
  4. "2019 HOLLING FAMILY SENIOR FACULTY EXCELLENCE IN TEACHING AWARD" in recognition of providing an exemplary educational environment. UNL-IANR. March 12, 2019. Lincoln, NE.
  5. "UNL SERVICE AWARD" September 25, 2018. Lincoln, NE.
  6. "2018 UNL COLLEGE of ENGINEERING COLLEGE FACULTY SERVICE AWARD" recognizes outstanding individuals for service to their academic unit, college and university, as well as profession and community. April 5, 2018. Lincoln, NE.
  7. "2018 UNL DIVISION OF STUDENT AFFAIRS, THE PARENTS ASSOCIATION AND TEACHING COUNCIL'S CONTRIBUTIONS TO STUDENTS AWARD." Recognized for making significant difference in student's life. February 2, 2018. Lincoln, NE.
  8. "2017 UNL COLLEGE OF ENGINEERING IMPACTFUL RESEARCH AWARD." November 9, 2017. Lincoln, NE.
  9. "UNL COLLEGE OF ENGINEERING LAGERSTROM AWARD" presented to the Biological Systems Engineering Department based on department's outstanding accomplishments in providing service to its students, the College, the University, and the broader community. April, 2016. Lincoln, NE.
  10. "INNOVATIVE EXTENSION FACULTY AWARD" The award provides recognition of outstanding contributions by an Extension Specialist in the program area(s) relative to his/her assignment. The award recognizes leadership in developing and carrying out programs in cooperation with Extension Educators and other Extension Specialists. Presented by UNL Extension, November 13, 2014. Kearney, NE.
  11. "2014 UNL COLLEGE OF ENGINEERING RESEARCH AND CREATIVE ACTIVITY AWARD" for recognition of activities associated with investigation or experimentation aimed at the discovery and/or interpretation of facts and development of creative works or new products. April 15, 2014. Lincoln, NE.
  12. "2013 OMTVEDT INNOVATION AWARD" in recognition of exceptional service for leadership and significant contributions to the initial development of partnerships and programs in the Institute of Agriculture and Natural Resources. September 6, 2013. Lincoln, NE.
  13. Honored with the "HAROLD W. EBERHARD DISTINGUISHED PROFESSORSHIP." University of Nebraska-Lincoln Institute of Agriculture and the Natural Resources. January 1, 2013. Lincoln, NE.
  14. "CERTIFICATE OF APPRECIATION IN RECOGNITION OF SERVICE TO NEBRASKA NATIONAL GUARD AGRIBUSINESS DEVELOPMENT TEAMS (ADT1-4) SERVING IN AFGHANISTAN." Presented by Lynn M. Heng (NE ADT2 Commander); William J. Pruisa (NE ADT3 Commander); and Donald E. Kneifl (NE ADT4 Commander). October 2012. Lincoln, NE.
  15. "2011 UNL EXTENSION EXCELLENCE IN TEAM PROGRAMMING AWARD" (Team Leader) presented by the UNL Extension to recognize the importance of interdisciplinary team efforts in achieving the goals of UNL Extension in terms of problem identification, team strategy, grant success, productivity, and impact and the output of the team in relation to inputs. November 9, 2011. Kearney, NE.
  16. "OUTSTANDING YOUNG SCIENTIST AWARD." UNL Chapter of Sigma Xi (Scientific Research Society) for "novel contributions to understanding and optimizing water use in irrigated agriculture." April 2008. Lincoln, NE.
  17. "2007 HOLLING FAMILY TEACHING EXCELLENCE AWARD." Presented by the UNL-IANR and the Nebraska College of Technical Agriculture (NCTA). The award is given to outstanding faculty within NU's IANR and NCTA for their innovation, impact, and program quality in teaching. Lincoln, NE, 2007.
  18. "2007 DISTINGUISHED EXTENSION NEW EMPLOYEE AWARD" for recognition of outstanding extension programming. Grand Island, NE, 2007.
  19. Gamma Sigma Delta (The Honor Society of Agriculture) "in recognition of high scholarship, outstanding achievement or service." Lincoln, NE, 2007.
  20. "YOUNG RESEARCHER AWARD" presented by the Florida section of the American Society of Agricultural Engineers, Key West, FL, 2002.
  21. "UNIVERSITY OF FLORIDA PRESIDENTIAL RECOGNITION AWARD" in recognition of outstanding achievement and contributions to the University of Florida. Presented by President Charles E. Young, President of the University of Florida. Gainesville, FL, 2000.
  22. Gamma Sigma Delta (The Honor Society of Agriculture) "in recognition of high scholarship, outstanding achievement and service." Gainesville, FL, 2000.
  23. Florida Gamma Beta Chapter of Alpha Epsilon; The Honor Society of Agricultural, Food, and Biological Engineering, Gainesville, FL, 1999.
  24. "SECOND PRIZE WINNER" for a Poster Presentation in Engineering and Math." The 1999 Graduate Student Forum of the University of Florida. Gainesville, FL, 1999.
  25. "OUTSTANDING GRADUATE STUDENT AWARD (1998-1999)" presented by Agric. and Biological Eng. Dept., Institute of Food and Agricultural Sciences (IFAS), Univ. of Florida. Gainesville, FL, 1999.
  26. "OUTSTANDING ACADEMIC ACHIEVEMENT AWARD" presented by the College of Engineering, University of Florida. Gainesville, FL, 1999.
  27. "SECOND PRIZE WINNER" for a Poster Presentation in Ecology and Environmental Sciences." The 1998 Graduate Student Forum of the University of Florida. Gainesville, FL, 1998.
  28. Graduate Research Assistantship and fellowship, University of Florida, Agricultural and Biological Engineering Department. Gainesville, FL, 1999-2002.