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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

• 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. Phosphorus and Potassium Management For Cost-Effective Soybean Production. p. 251-258. In World Soybean Research Conf. VI. Proceedings. Aug. 4-7, 1999. Chicago, IL.
• 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. 1998. What is new in phosphorus and potassium management for soybeans and its impact on water quality. In Proceedings. Midwest Soybean Conference. August 7-9, 1998. Davenport, IA.
• Mallarino, A.P., and T.S. Murrell. 1998. No-till corn grain yield responses to band applications of potassium. Better Crops 82:4-6.
• Mallarino, A.P., and D. Wittry. 1998. Soil sampling strategies for variable rate P and K fertilization and liming. p. 251-256. In The Integrated Crop Management Conference. Proceedings. Nov. 17-18, 1998. Iowa State Univ. Extension. Ames, IA.
• 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 D. Wittry. 1997. Use of DGPS, yield monitors, soil testing, and variable rate technology to improve phosphorus and potassium management. p. 267-275. In The Integrated Crop Management Conference. Proceedings. Nov. 17-18, 1997. Iowa State Univ. Extension. Ames, IA.
• 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.
• Mallarino, A.P. 1996. Phosphorus and potassium fertilization of corn and soybean. In Proceedings. Midwest Soybean Conference. August 9-12, 1996. Des Moines, IA.
• Mallarino, A.P., J.M. Bordoli, and R. Borges. 1996. Phosphorus and potassium placement for no-till corn. p. 133-136. In The Integrated Crop Management Conference. Proceedings. Nov. 19-20. Iowa State Univ. Extension. Ames, IA.

Abstracts

• Barbagelata, P.A., and A.P. Mallarino. 2004. On-farm research methods for soil test potassium calibration using precision agriculture technologies. Agron. Abs. CD-ROM. ASA-CSSA-SSSA. Madison, WI.
• Bermudez, M., A.P. Mallarino, and D.J. Wittry. 2002. Grain yield and soil-test spatial variability under uniform or variable-rate phosphorus and potassium fertilization. Agron. Abs. CD-ROM. ASA-CSSA-SSSA, Madison, WI.
• Wittry, D.J., A.P. Mallarino, and P. Barbagelata. 2002. Ammonium acetate, Mehlich-3, and sodium tetraphenyl-boron soil potassium tests for corn and soybean. Agron. Abs. CD-ROM. ASA-CSSA-SSSA, Madison, WI.
• Bermudez, M., and A.P. Mallarino.  2000.  Corn response to starter fertilizer and reduced tillage in fields with no-till management.  p. 366. In Agronomy Abstracts, ASA, Madison, WI.
• Borges, R., and A.P. Mallarino.  2000.  Interactions between starter and preplant P-K fertilization in no-till and ridge-till corn.  p. 366. In Agronomy Abstracts, ASA, Madison, WI.
• Mallarino, A.P., and M. Ul-Haq. 1999. Soybean response to early foliar fertilization with N, P, K, S, and microniutrients. p. 257. In Agronomy Abstracts, ASA, Madison, WI.
• Borges, R., and A.P. Mallarino. 1999. Estimating P and K availability by plant analysis in corn-soybean fields receiving band fertilization. p. 318-319 In Agronomy Abstracts, ASA, Madison, W.
• Borges, R., and A.P. Mallarino. 1999. Soil P and K stratification when deep-banding for the corn-soybean rotation. p. 319. In Agronomy Abstracts, ASA, Madison, WI.
• Haq, M.U., A.P. Mallarino, and D.J. Wittry. 1998. Within and between field variability in soybean response to foliar fertilization. p. 316. In Agronomy Abstracts, ASA, Madison, WI.
• Wittry, D.J., A.P. Mallarino, P.N. Hinz, and D. Dousa. 1998. Study and management of phosphorus and potassium fertility with precision agriculture. p. 316. In Agronomy Abstracts, ASA, Madison, WI.
• Mallarino, A.P., R. Borges, and J.C. North. 1997. Phosphorus and potassium placement for corn grown with conservation tillage. p. 12. In Sustainable agriculture: Taking stock, moving forward. Leopold center for Sustainable Agriculture. Poster Abstracts. Leopold Center Tenth Anniversary Conference. July 30-31, Ames, IA.
• Borges, R., and A.P. Mallarino. 1997. Deep banding phosphorus and potassium fertilizer for ridge-till corn and soybean. p. 303. In Agronomy Abstracts, ASA, Madison, WI.

Presentations

Links

• ISU Research and Demonstration Farms Annual Progress Reports

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