• Extension Publications
• Newsletter Articles
• Conference Proceedings and Reports
• Abstracts
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• Presentations
• Links

Extension Publications (pdf)

• SF-1321 Effectiveness of Gypsum in the North-Central Region of the U.S.
• PM 1310 Interpretation of Soil Test Results
• PM 1688 A General Guide for Crop Nutrient and Limestone Recommendations in Iowa
• NCR-533 Soil Cation Ratios for Crop Production

Newsletter Articles

• 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)

Conference Proceedings and Reports (pdf)

• 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)
  

Abstracts

Presentations

• 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)

Links

• ISU Research and Demonstration Farms Annual Progress Reports

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