Soil Fertility

Secondary and Micro-Nutrients

• Extension Publications
• Newsletter Articles
• Conference Proceedings and Reports
• Photo Gallery
• 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)

• Mallarino, A.P., R.R. Oltmans, J.R. Prater, C.X. Villavicencio, and L.B. Thompson. 2011. Nutrient Uptake by Corn and Soybean, Removal, and Recycling with Crop Residue. p. 103-113. In Proc. 23rd Annual Integrated Crop Management Conf., Ames, IA 30 Nov. – 1 Dec. 2011. Iowa State Univ., Ames, IA (pdf)
• Voss, R. 1998. Micronutrients. Iowa State Univ., Ames, IA (pdf)
• Sawyer, J., B. Lang, and D. Barker. 2011. Sulfur emerges as a nutritional issue in Iowa alfalfa production. p. 6-7. Better Crops, Vol. 95 (2011, No.2).  (pdf)
• Sawyer, J., B. Lang, and D. Barker. 2011. Sulfur fertilization response in Iowa corn production. p. 8-10. Better Crops, Vol. 95 (2011, No. 2). (pdf)
• Rehm G., What’s new with micronutrients in our part of the world? Iowa State Univ., Ames, IA (pdf)
• Sawyer, J., and D. Barker. 2011. Evaluation of combination phosphorus - sulfur fertilizer products for corn production. Iowa State Univ., Ames, IA (pdf)
• Sawyer, J., D. Barker, and B. Lang. 2010. Summary of sulfur strip trials conducted in central and northeast Iowa. Preliminary 2009 results. Iowa State Univ., Ames, IA. (pdf)
• Sawyer, J., B. Lang, D. Barker, and G. Cummins. 2009. Dealing with sulfur deficiency in Iowa corn production. p. 117-123. In Proc. 21st Annual Integrated Crop Manag. Conf., Ames, IA. 2-3 Dec. 2009. Iowa State Univ., Ames, IA (pdf)
• Sawyer, J.E., B. Lang, D.W. Barker, and G. Cummins. 2009. Dealing with sulfur deficiencies in crop production: the Iowa experience. p. 64-73. In Proc. Thirty-Ninth North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 18-19 Nov. 2009. Vol. 25. International Plant Nutrition Inst., Brookings, SD. (pdf)
• Sawyer, J., B. Lang, G. Cummins, and D. Barker. 2009. Evaluation of corn response to sulfur fertilization in central to northeast Iowa. Project report for 2007-2008 research. Iowa State Univ., Dept. of Agronomy, Ames, IA. (pdf)
• Sawyer, J., Brian Lang, and Daniel Barker. Dealing with Sulfur Deficiencies in Crop Production: the Northeast Iowa Experience. Indiana CCA Conference, Dec. 16-17, 2008, Indianapolis, IN
• 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)
  

Presentations

• Dealing with sulfur deficiency in Iowa crop production. Sawyer, J. E., Lang, B., and D.W. Barker, 2011. Crop Pest Manag. Shortcourse, Univ. of Minnesota. (pdf)
• Secondary and micronutrients. Sawyer, J.E., 2004. Soil Fertility and Nutrient Management Short Course, Iowa State Univ. (pdf)
• Gypsum. Sawyer, J.E., 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)

Links

• ISU Research and Demonstration Farms Annual Progress Reports

top