E-mail: williams@brc.tamus.edu Phone: (254) 774-6124 Fax: (254) 774-6001 Address: Blackland Research Center 720 E. Blackland Road Temple, Texas 76502 RESEARCH INTERESTS My research is focused on the development of mathematical models for use in agricultural management. The models range from field scale (EPIC) to whole-farm, small watershed scale (APEX) and are useful in solving a variety of problems involving hydrology, erosion (wind and water), crop production, water quality, salinity, global climate change, etc. Comprehensive mechanistic models are required to obtain realistic solutions for problems involving complex natural systems. EDUCATION B.S. Texas A&M University, 1963 M.S. Texas A&M University, 1969 Ph.D. Texas A&M University, 1977

CURRENT POSITION

Senior Research Scientist

PROFESSIONAL and HONORARY SOCIETIES

• American Society of Civil Engineers

RECENT PUBLICATIONS

• J. Cavero, R.E. Plant, C. Shennan, J.R. Williams, J.R. Kiniry, and V.W. Benson. Application of EPIC Model to Nitrogen Cycling in Irrigated Processing Tomatoes Under Different Management Systems. Agricultural Systems 56, No. 4 pp. 391-414, 1998.
• S.W. Chung, P.W. Gassman, L.A. Kramer, J.R. Williams, and R. Gu. Validation of EPIC for Two Watersheds in Southwest Iowa. J. Environ. Qual. 28:971-979(1999).
• J. Cavero, R. E. Plant, C. Shennan, D. B. Friedman, J. R. Williams, J. R. Kiniry, and V. W. Benson. Modeling Nitrogen Cycling in Tomato-Safflower and Tomato-Wheat rotations. Agricultural System 60 (1999), pp. 123-135.
• Tharacad S. Ramanarayanan, M. V. Padmanabhan, G. N. Gajanan, Jimmy Willams. Comparison of Simulated and Observed Runoff and Soil Loss on three Small United States Watersheds. NATO ASI Series. 1988; 1(55):76-88.
• J.G. Arnold, R. Srinivasan, R. S. Muttiah, J. R. Williams. Large Area Hydrologic Modeling and Assessment Part I: Model Development. Journal of the American Water Resources Association. 1998; 1(34):73-89.
• J. R. Williams, J. G. Arnold. A System of Erosion-Sediment yield models. Soil Technology 1997;(11):43-55.