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Dr. Mike Stewart

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2423 Rogers Key
San Antonio, TX 78258
Dr. Mike Stewart, a native of southwest Texas, is the Southern and Central Great Plains Regional Director for IPNI. Dr. Stewart earned his B.S. degree from Texas Tech University and his M.S and Ph.D. degrees from the Texas A&M University, all in the discipline of soil science. Between his M.S. and Ph.D. degrees Dr. Stewart held several positions in the agricultural industry. He managed dry fertilizer blend plants and was a turf specialist for a distributor of specialty fertilizer before returning to Texas A&M in 1993. Dr. Stewart joined the Institute (originally PPI) immediately after completing his Ph.D. degree in 1996 and resides in San Antonio, Texas.


B.S. Soil Science, 1980 Texas Tech University
M.S. Soil Science, 1983 Texas A&M University
Ph.D. Soil Science, 1996 Texas A&M University

Awards & Recognition

Texas Utilities Mining Company Fellowship recipient, 1993-1996

Texas Association of Environmental Professionals Scholarship recipient, 1993

ASA (A-4) Educational Materials Award, 2000

Certified Professional Soil Scientist/Agronomist

Phi Kappa Phi

Alpha Zeta

Sigma Xi

Gamma Sigma Delta

Professional Service

Chair, American Society of Agronomy A-9 Division, 2008

Industry Agronomist Award Committee, American Society of Agronomy, 2001-2003

Soil Science Industry Award Committee, Soil Science Society of America, 2008-2010

Chapter author for ASA monograph, ‘Phosphorus: Agriculture and the Environment’

Technical reviewer of manuscripts for SSSAJ and AJ

Chair, Beltwide Cotton Conference, Soil and Plant Nutrition Technical Conference, 2008

Great Plains Soil Fertility Conference planning committee member

Southwest Fertilizer Conference planning committee member

Golf Course and Turfgrass Management Program advisory board member, Texas State Technical College, Waco Texas

J. Fielding Reed Scholarship selection committee member

IPNI Scholar Award selection committee member

Fluid Fertilizer Foundation Research and Education committee member

Selected Publications

Green, C. J., W. M. Stewart, and J. Ping. 2000. An overview of precision agriculture in the United States of America. p. 65-69. In Reasonable Use of Fertilizers. Proc. of 6th International Conf. 30 Nov. Czech University of Agriculture in Prague.

Haby, V.A., W.M. Stewart, and A. T. Leonard. 2008. Tifton 85 bermudagrass response to potassium, chloride and sulfur at two nitrogen rates. p. 134-139. In Great Plains Soil Fert. Conf. Proc., Denver, CO. 4-5 March. 2008.

Hons, F. M., W. M. Stewart, and L. R. Hossner. 1986. Factor interactions and their influence on hydrolysis of condensed phosphates in soils. Soil Sci. 141:408-416.

Lester, G.E., J.L. Jifon, and W.M. Stewart. 2007. Foliar Potassium Improves Cantaloupe Marketable and Nutritional Quality. Better Crops with Plant Food. 91 (1): 24-25.

Stewart, W. M. 2008. Best Management Practices for Turf and Lawn Fertilization. Ref. # 08061. IPNI, Norcross, GA.

Stewart, W. M., and T. W. Bruulsema. 2001. Crop nutrition and functional foods. p. 31-36. In Southern Soil Fert. Conf. Proc., Memphis, TN. 9-10 Oct. 2001. Noble Foundation, Ardmore, OK.

Stewart, W.M., D.W. Dibb, A.E. Johnston, and T.J. Smyth. 2005. The contribution of commercial fertilizer nutrients to food production. Agron. J. 97: 1-6.

Stewart, W.M. and W.B. Gordon (ed.). 2008. Fertilizing for Irrigated Corn- Guide to Best Management Practices. Ref. # 08053. IPNI, Norcross, GA.

Stewart, W.M., L.L. Hammond, and S.J. Van Kauwenbergh. 2005. Phosphorus as a natural resource. p. 3-22. In T.J. Sims and A.N. Sharpley (ed.) Phosphorus: Agriculture and the Environment. ASA, CSA, and SSSA, Madison, WI.

Stewart, W. M., and L. R. Hossner. 2001. Factors affecting the ratio of cation exchange capacity to clay content in lignite overburden. J. Environ. Qual. 30: 1143-1149.

Stewart, W. M., and A. J. Schlegel. 1998. Return of CRP land to crop production. p. 208-213. In Great Plains Soil Fert. Conf. Proc., Denver, CO. 3-4 March. 1998.