Soil Fertility

(515) 294-1923

Secondary and Micro-Nutrients

Interpreting results of the Mehlich-3 ICP soil phosphorus test (11/2003)
Soil calcium:magnesium ratios (4/2003)
Gypsum: an old product with a new use? (4/2003)
Nonconventional soil additives (4/21/2003)
Is it iron or potassium deficiency (7/2002)
Interpreting Mehlich-3 soil test results (2/1999)

Sawyer, J., B. Lang, and D. Barker. 2008. Evaluation of corn response to sulfur fertilization in northeast Iowa. Project report for 2006 and 2007 research. Iowa State Univ., Dept. of Agronomy, Ames, IA. (pdf)
Lang, B., J. Sawyer, and S. Barnhart. 2006. Dealing with sulfur deficiency in northeast Iowa alfalfa production. p. 225-235. In Proc. 18th Annual Integrated Crop Manag. Conf., Ames, IA. 29-30 Nov. 2006. Iowa State Univ., Ames, IA. (pdf)
Sawyer, J.E., and D.W. Barker. 2002. Corn and soybean response to sulfur application on Iowa soils. p. 157-163. In Proc. Thirty Second North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 20-21 Nov. 2002. Potash and Phosphate Inst., Brookings, SD. (pdf)
Sawyer, J.E. and D.W. Barker. 2002. Sulfur application to corn and soybean crops in Iowa. p. 13-24. In Proc. 14th Annual Integrated Crop Manag. Conf., Ames, IA. 4-5 Dec. 2002. Iowa State Univ., Ames, IA. (pdf)
Bickel, A., and R. Killorn. 2001. Spatial response of corn to banded zinc sulfate in Iowa. In Proc. Thirty First North Central Extension-Industry Soil Fertility Conf., Des Moines, IA 14-15 Nov. 2001. Potash and Phosphate Inst., Brookings, SD
Mallarino, A.P., D. Haden, and A. Christensen. 2000. Sulfur fertilization for corn. p. 19-21. In Annual progress reports-1999. Northwest research and demonstration farm. ISRF99-29, 31. Iowa State Univ., Ames, IA. (pdf)

Secondary and micronutrients. 2004 Soil Fertility and Nutrient Management Short Course, Iowa State Univ. (pdf)
Gypsum. 2004 Crop Advantage Series, Iowa State Univ. (pdf)
Sulfur application to corn and soybean crops in Iowa. Sawyer, J.E. and D.W. Barker. 2002. Presented at the 14th Annual Integrated Crop Manag. Conf., Ames, IA. 4-5 Dec. 2002. Iowa State Univ., Ames, IA. (pdf, 1.6MB)