Soil Fertility

Potassium

• Extension Publications
• Newsletter Articles
• Conference Proceedings and Reports
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• Presentations
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Extension Publications (pdf)

• PM 1688 A General Guide for Crop Nutrient and Limestone Recommendations in Iowa
• PM 1310 Interpretation of Soil Test Results
• SP 126 Interpreting Mehlich-3 Soil Test Results

Newsletter Articles

• You couldn't apply phosphorus and potassium last fall and now it's too wet (4/2008)
• Plan carefully for potassium fertilization this fall (9/2005)
• Use new potassium soil test and fertilizer recommendations (10/2003)
• Is it iron or potassium deficiency? (7/2002)
• Corn leaf potassium deficiency symptoms (7/2002)
• Corn and soybean responses to deep-band phosphorus and potassium (9/2000)
• Potassium deficiency symptoms in corn (6/2000)
• Effective use of precision agriculture for improved management of phosphorus, potassium, and lime (5/1999)
• Interpreting P and K soil test results (1/1999)
• Symptoms of dry soil-induced potassium deficiency (6/1997)
• Dry weather induces potassium deficiency (7/1996)

Conference Proceedings and Reports (pdf)

• Clover, M.W., A.P. Mallarino, and P.A. Barbagelata. 2007. Corn and soybean grain yield and concentration of potassium in plant tissues and soil as affected by potassium fertilization. p. 119-125. In Proc. Thirty-Seventh North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 14-15 Nov. 2007. Vol. 23. International Plant Nutrient Inst., Brookings, SD.
• Mallarino, A.P., and D.J. Wittry. 2006. Variable-rate application for phosphorus and potassium: impacts on yield and nutrient management. p. 219-224. In Proc. 18th  Annual Integrated Crop Manag. Conf., Ames, IA. 29-30 Nov. 2006. Iowa State Univ., Ames, IA. (pdf)
• Mallarino, A.P., P.A. Barbagelata, and K. Van Dee. 2005. Potassium fertilization effects on soil-test potassium and yields of corn and soybeans. p. 26-27. In Annual progress reports-2004. Northwest Research and Demonstration farm. ISRF04-34. Iowa State Univ., Ames, IA. (pdf)
• Mallarino, A.P., and D. Rueber. 2005. Phosphorus and potassium fertilization and placement methods for corn-soybean rotations managed with no-till and chisel plow tillage. p. 12-13. In Annual progress reports-2004. Northern Research and Demonstration farm. ISRF04-22. Iowa State Univ., Ames, IA. (pdf)
• Mallarino, A.P., and K. Pecinovsky. 2005. Phosphorus and potassium placement methods for corn and soybeans managed with no-till and chisel plow tillage. p. 44-45. In Annual progress reports-2004. Northeast research and demonstration farm. ISRF04-13.
• Mallarino, A.P., P.A. Barbagelata, and D.J. Wittry. 2004. Soil-test potassium field calibrations for soybean Iowa interpretations and research update. p. 67-70. In North-Central Extension-Industry Soil Fertility Conf. Proceedings. Vol. 20. Des Moines, IA. (pdf)
• Mallarino, A.P. 2004. Revision of potassium soil-test interpretations and fertilizer recommendations. In Indiana Crop Advisers Convention. Proceedings. December 14-16, Indianapolis, IN. (pdf)
• Mallarino, A.P., and K. Pecinovsky. 2004. Long-term phosphorus and potassium fertilization strategies for corn-soybean rotations. p. 22-23. In Annual progress reports-2003. Northeast research and demonstration farm. ISRF03-13. Iowa State Univ., Ames, IA. (pdf)
• Mallarino, A.P., and D. Haden. 2004. Phosphorus and potassium placement for corn and soybeans managed with no-till and chisel-disk tillage. p. 14-15. In Annual progress reports-2003. Northwest research and demonstration farm. ISRF03-29,31. Iowa State Univ., Ames, IA. (pdf)
• Mallarino, A.P., B. Havlovic, and J. Butler. 2004. Phosphorus and potassium fertilizer placement for corn and soybeans managed with no-till and chisel-disk tillage. p. 19-20. In Annual progress reports-2003. Armstrong research and demonstration farm. ISRF00-12. Iowa State Univ., Ames, IA. (pdf)
• Mallarino, A.P. 2003. Starter and foliar fertilization. Are they needed to supplement primary fertilization? p. 113-120. In The Integrated Crop Management Conf. Proceedings. Dec. 3-4, Ames, IA. Iowa State Univ. Extension.
• Kaiser, D.E., A.P. Mallarino, and M. Bermudez. 2003. In-furrow starter and broadcast phosphorus and potassium fertilization for corn. p. 186-189. In North-Central Extension-Industry Soil Fertility Conf. Proceedings. Vol. 19. Des Moines, IA. (pdf)
• Mallarino, A.P., and D. Rueber. 2003. Long-term evaluation of nitrogen, phosphorus, potassium, and lime requirements of continuous corn. p. 7-8 In Annual progress reports-2002. Northern Research and Demonstration farm. ISRF02-22. Iowa State Univ., Ames, IA.
• Mallarino, A.P., and K. Van Dee. 2003. Phosphorus and potassium placement for corn and soybeans managed with no-till and chisel-plow tillage. Annual progress reports-2002. Northwest Research and Demonstration farm. ISRF02-34. Iowa State Univ., Ames, IA.
• Mallarino, A.P., and D. Wittry. 2000. How can we make intensive soil sampling and variable-rate P and K fertilization cost-effective? p. 203-210. In The Integrated Crop Management Conf. Proceedings. Nov. 29-30, 2000. Ames, IA. Iowa State Univ. Extension
• Mallarino, A.P., R. Borges, and D. Wittry. 2001. Corn and soybean response to potassium fertilization and placement. p. 5-11. In North-Central Extension-Industry Soil Fertility Conf. Proceedings. Vol. 16. Des Moines, IA.
• Mallarino, A.P., and D. Rueber. 2000. Long-term potassium fertilization for the corn-soybean rotation. p. 31-33. In Annual progress reports-1999. Northern research and demonstration farm. ISRF99-22. Iowa State Univ., Ames, IA.
• Mallarino, A.P. 1999. Alternatives for P and K management: A role for deep banding and starter? p. 247-253. In The Integrated Crop Management Conference. Proceedings. Dec. 1-2, 1999. Iowa State Univ. Extension. Ames, IA.
• Sawyer, J.E. and D. Barker. 1999. Foliar fertilization of corn with mono-potassium phosphate and urea. Final research report. Iowa State Univ., Ames, IA (pdf)
• Sawyer, J.E. 1999. Making every fertilizer dollar pay. p. 63-78. In Proc. Integrated Crop Manag. Conf., Ames, IA. 1-2 Dec. Iowa State Univ., Ames, IA. (pdf)
• Mallarino, A.P., D.W. Barker, R. Borges, and J.C. North. 1998. Tillage and fertilizer placement for the corn-soybean rotation. p. 231-237. In The Integrated Crop Management Conference. Proceedings. Nov. 17-18, 1998. Iowa State Univ. Extension, Ames, IA.
• Mallarino, A.P., and Haq, M.U. 1998. Foliar fertilization of soybeans. p. 20-26. In North Central Extension-Industry Soil Fertility Conference. Proceedings. Vol. 14. St. Louis, MO. (pdf)
• Mallarino, A.P., and T.S. Murrell. 1998. No-till corn grain yield responses to band applications of potassium. Better Crops 82:4-6.
• Sawyer, J.E. 1998. Managing crop nutrients and limestone with reduced financial resources. p. 33-36. In Proc. Integrated Crop Manag. Conf., Ames, IA. 17-18 Nov. Iowa State Univ., Ames, IA. (pdf)
• Mallarino, A.P. 1997. Placement of phosphorus and potassium for no-till and ridge-till corn. The Practical Farmer. 12:20-23.
• Mallarino, A.P., and R. Borges. 1997. Deep banding phosphorus and potassium for no-till corn and soybeans. p.129-135. In North Central Extension-Industry Soil Fertility Conference. Proceedings. Vol. 13. St. Louis, MO.

Presentations

Links

• ISU Research and Demonstration Farms Annual Progress Reports

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