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E-mail: revans[at]sidney.ars.usda.gov

EDUCATION

CURRENT RESEARCH

In January 2001, Dr. Evans assumed the position of Supervisory Agricultural Engineer, Research Leader and Facilities Coordinator of the Agricultural Systems Research Unit. Bob’s research directly addresses three broad, overlapping areas: 1) water conservation and improved on-farm water management; 2) environmental management and quality (with a recent emphasis on precision agriculture technologies); and, 3) multiple uses of irrigation systems and management alternatives to reduce chemical use.

RESEARCH EXPERIENCE

Prior to joining the USDA-ARS, Bob served as the Colorado state extension irrigation specialist located in Ft. Collins, CO in 1976 where he worked on statewide water management issues including on farm water management, scientific irrigation scheduling, groundwater pollution and agricultural salinity problems. In October 1980, he accepted a position at the Irrigated Agriculture Research and Extension Center (IAREC) at Washington State University-Prosser as a research agricultural engineer. He was a tenured professor in the Biological Systems Engineering Department at Washington State University with a 100% research appointment although about 25% of his efforts were in extension and teaching activities. The focus of his research has been on soil/water conservation and improved water quality while enhancing the economic viability of agricultural enterprises. The internationally recognized research has primarily been focused on long-term, multi-disciplinary team research on irrigated farming systems. It emphasizes an integrated systems approach to solving present and future problems facing irrigated agriculture. Most of the research projects are long-term, in-depth interdisciplinary team research efforts from 3 to 10 years in duration. He has been at the forefront of knowledge in his interdisciplinary research in precision agriculture, a set of tools that production agriculture can profitably use to meet the environmental and economic challenges of the next century. He is considered one of the foremost authorities in the world on cold temperature protection of orchard and vineyard crops and has frequent national and international visitors and requests for presentations and workshops in the area.

IRRIGATION INFORMATION AVAILABLE TO DOWNLOAD

Center Pivot Irrigation (.pdf)

Energy Balance of Apples Under Evaporative Cooling (.pdf)

Evaluating Cokriging for Improving Soil Nutrient Sampling Efficiency (.pdf)

Frost Protection in Orchards and Vineyards (.pdf)

Irrigation Technologies Comparisons (.pdf)

Microirrigation (.pdf)

Overtree Evaporative Cooling System Design & Operation for Apples in the PNW (.pdf)

Review of the Application of Polyacrylamides for Soil Erosion Reduction Through Sprinklers (.pdf)

Irrigation Research

• Evans, R.G., S.E. Spayd, R.L. Wample, M.W. Kroeger, and M.O. Mahan. 1993. Water use of Vitus vinifera grapes in Washington. Agr. Water Mgmt. 23(1993):109-124.
• Evans, R.G., B. N. Girgin, J. Chenoweth, and M. W. Kroeger, 1995. Surge Flow Furrow Irrigation and Residues to Reduce Soil Erosion. Agricultural Water Management. Elsevier. Amsterdam, The Netherlands. 27:283-297.
• Evans, R.G., S. Han, M.W. Kroeger, 1995. Distribution Uniformity Evaluation for Chemigation with Center Pivots. Trans. of the ASAE. 38(1):85-92.
• Evans, R.G., M.W. Kroeger, and M.O. Mahan, 1995. Evaporative Cooling of Apples by Overtree Sprinkling. Applied Engineering in Agriculture. ASAE. 11(1):93-99.
• Evans, R.G., 2000. The Art of Protecting Vineyards from Cold Temperature Injury. Am. J. Enol. and Vitic. 51(5):60-72.
• Evans, R.G., G.W. Buckleiter, C.R. Camp, B.A. King and G.B. Harting, 2000. Control Systems for Precision Irrigation with Self-Propelled Systems. In: Proceedings 4th Decennial National Irrigation Symposium. Edited by R.G. Evans, B.L. Benham and T.P. Trooien. November 14-16, 2000. American Society of Agricultural Engineers, St. Joseph, MI. (Publication 701P0004). pp. 322-321.

• Evans, R.G., 2004. Energy Balance of Apples Under Evaporative Cooling. Transactions of ASAE. (In Press)

• Wample, R.L., S.E. Spayd, R.G. Evans and R.G. Stevens, 1993. Nitrogen fertilization of `White Riesling' grapes in Washington: Nitrogen and seasonal effects on bud cold hardiness and carbohydrate reserves. Am. J. Enol. and Vitic. 44(2):159-167. (Note: this paper was selected as the "Outstanding Paper of 1993" by ASEV.)
• Spayd, S.E., R.L. Wample, R.G. Stevens, R.G. Evans, and A.Kawakami. 1993. Nitrogen Fertilization of 'White Riesling' Grapes in Washington: Effects on Petiole Nutrient Concentration, Yield, Yield Components and Vegetative Growth. Am. J. Enol. Vitic. 44(4):378-386.
• Spayd, S.E. R.G. Stevens, R.L. Wample, R.G. Evans, B.J. Seymour, and C.W. Nagel, 1994. Nitrogen fertilization of `White Riesling' grapes in Washington: Effects on juice and wine composition. Am. J. Enol. and Vitic. 45(1):34-42.
• Han, S, R.G. Evans, M.W. Kroeger, 1994. Sprinkler Distribution Patterns in Windy Conditions. Trans. of the ASAE. 37(6):1481-1489.
• Kjelgaard, J.F., C.O. Stockle, J.M. Villar Mir, R.G. Evans and G.S. Campbell, 1994. Evaluating Methods to Estimate Corn Evapotranspiration from Short-Time Interval Weather Data. Trans. of the ASAE. 37(6):1825-1833.
• Han, S., R.G. Evans, T. Hodges and S.L. Rawlins, 1995. Linking a GIS with a Potato simulation Model for Site-Specific Crop Management. J. of Environmental Quality 24(4):772-777. July-August.
• Ebel, R.C., E.L. Proebsting and R.G. Evans, 1995. Deficit Irrigation to Control Vegetative Growth in Apple and Monitoring Fruit Growth to Schedule Irrigation. HortScience 30(6):1229-1232.
• Drake, S.R. and R.G. Evans, 1997. Irrigation management influence on fruit quality and storage life of ‘Redspur’ and ‘Golden Delicious Apples. Fruit Varieties Journal 51:7-12.
• Han, S., S.L. Rawlins and R.G. Evans, 1997. A Bitmap Method for Determining Harvest Width in Yield Mapping. Transactions of ASAE. 40(2):485-490.
• Camp, C.R., F. Lamm, R. G. Evans, and C.J. Phene, 2000. Subsurface Drip Irrigation - Past, Present and Future. In: Proceedings 4th Decennial National Irrigation Symposium (refereed). Edited by R.G. Evans, B.L. Benham and T.P. Trooien. November 14-16, 2000. American Society of Agricultural Engineers, St. Joseph, MI. (Publication 701P0004). pp. 363-372.
• Felsot, A.S., R.G. Evans and L.C. Tallman, 2000. Soil Distribution and Plant Uptake of Imidicloprid under Drip and Surface Irrigation. In: Proceedings 4th Decennial National Irrigation Symposium (refereed). Edited by R.G. Evans, B.L. Benham and T.P. Trooien. November 14-16, 2000. American Society of Agricultural Engineers, St. Joseph, MI. (Publication 701P0004). pp. 416-427.
• Buchleiter,G.W., C. Camp, R.G. Evans, and B.A. King, 2000. Technologies for Variable Water Application with Sprinklers In: Proceedings 4th Decennial National Irrigation Symposium (refereed). Edited by R.G. Evans, B.L. Benham and T.P. Trooien. November 14-16, 2000. American Society of Agricultural Engineers, St. Joseph, MI. (Publication 701P0004). pp.316-321.
• Sadler, E.J., R. G. Evans, G.W. Buchleiter, B.A. King, and C.R. Camp, 2000. Site-Specific Irrigation - Management and Control. In: Proceedings 4th Decennial National Irrigation Symposium (refereed). Edited by R.G. Evans, B.L. Benham and T.P. Trooien. November 14-16, 2000. American Society of Agricultural Engineers, St. Joseph, MI. (Publication 701P0004). pp. 304-315.
• Spayd, S. E., R. G. Stevens, R. L. Wample, R. G. Evans, C. G. Edwards, and D. Webster. 2000. Impact of nitrogen fertilization on vine performance and juice and wine composition of 'Riesling' grapes (Vitis vinifera L.) in Washington State. In: J. V. Possingham and G. H. Neilsen (Eds.) XXV International Horticultural Congress, Part 2: Mineral Nutrition and Grape and Wine Quality. Acta Horticulturae No. 512, pp. 65-75.
• Davenport, J.R., C.A. Redulla, M.J. Hattendorf, R.G. Evans and R.A. Boydston. 2002. Potato Yield Monitoring on Commercial Fields. HortTechnology. April-June 12(2):289-296.
• Redulla, C.A., J.R. Davenport, R.G. Evans, M.J. Hattendorf, A.K. Alva and R.A. Boydston. 2002. Relating potato yield and quality to variability in soil characteristics. American Journal of Potato Research. 79:317-323
• Han, S. M. Schneider, R. G. Evans, 2003. Evaluating Cokriging for Improving Soil Nutrient Sampling Efficiency. Transactions of ASAE. 46(3):845-849.
• Han, S., S.M. Schneider, R.G. Evans, and J.R. Davenport, 2003. Block Estimating of Spatial Yield Data and Its Uncertainty. Precision Agriculture. 5(1): 73-84. Kluwer Academic Publishers. Dordrecht, The Netherlands.

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