Corn Nitrogen Rate Calculator

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

Extension Publications (pdf)

• AEP0200f Nitrogen Fertilization for Continuous and Rotated Corn
• PM 2026 Sensing Nitrogen Stress in Corn
• PM 2015 Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn
• Agricultural Nitrogen Management for Water Quality Protection in the Midwest
• IPM 67a Nitrogen Options miniposter
• IPM 69a Don't Go Until It's 50° or Below! miniposter
• PM 869 Fertilizing Pastures
• PM 1310 Interpretation of Soil Test Results
• PM 1584 Cornstalk Testing to Evaluate Nitrogen Management
• PM 1714 Nitrogen Fertilizer Recommendations for Corn in Iowa
• PM 1747 Rate Variability of Anhydrous Ammonia Applicator Equipment
• PM 1875 Improving the uniformity of anhydrous ammonia application
• NMEP 7 Nitrogen Application
• NCH 55 Nitrification Inhibitors for Corn Production

Newsletter Articles

• Don’t double dip soybean (11/12/2007)
• Nitrogen loss: How does it happen? (5/14/2007)
• Estimating nitrogen losses (5/14/2007)
• Measuring the nitrogen status (5/14/2007)
• Corn response to supplemental nitrogen (5/14/2007)
• UAN and preemergence herbicide applications on emerged corn (4/23/2007)
• Nitrogen fertilization for corn following corn (2/12/2007)
• Increasing the frequency of corn in crop sequences (2/12/2007)
• Corn nitrogen rate calculator web tool updated (9/18/2006)
• Corn stalk nitrate interpretation (9/18/2006)
• New publication offers rationale for nitrogen use in corn production (7/31/2006)
• High nitrogen fertilizer prices - again (10/2005)
• The Illinois soil nitrogen test: should it be used in Iowa? (10/10/2005)
• Remember 50°F (9/2005)
  
• Checking corn nitrogen status (5/2005)
• High prices and tight supply make tough fertilization decisions (10/2004)
• Nitrogen losses after the heavy rains (6/2004)
• Assessing nitrogen losses (6/2004)
• Natural gas prices impact nitrogen fertilizer costs (4/2003)
• Getting the most from nitrogen fertilizer dollars (4/2003)
• Hailed-out soybean fields (10/2002)
• Corn yields at reduced rates of spring nitrogen in 2001 (3/2002)
• Equipment maintenance: fertilizer applicators (2/2002)
• Nitrogen applications and residue decomposition (11/2001)
• Application checkpoints for fall ammonia (10/2001)
• Nitrogen application questions (10/2001)
• Why 50 degrees Fahrenheit? (10/2001)
• N management influences on N losses through tile lines (8/2001)
• It is not too late to apply nitrogen for 2001 (7/2001)
• Nitrogen losses in 2001 (6/2001)
• Post-plant nitrogen applications on corn (5/2001)
• Equipment considerations: dry granular fertilizer (4/2001)
• Equipment considerations: anhydrous ammonia (4/2001)
• Value of crop rotation in nitrogen management (4/2001)
• Nitrogen fertilizer management options (2/2001)
• Making every fertilizer nitrogen dollar pay (1/2001)
• Natural gas prices affect nitrogen fertilizer costs (1/2001)
• Anhydrous application and dry soils (10/2000)
• What about N losses in 2000 (7/2000)
• Hold nitrogen on manured cornfields in 2000 (2/2000)
• Estimating nitrogen losses (6/1999)
• Broadcast postemergence UAN solution (5/1999)
• Optimal rates of side-dressed nitrogen in 22 strip-plot trials (5/1999)
• Monitoring nitrogen deficiencies in corn (5/1999)
• Potential for nitrogen fertilizer variable rate management: a case study (4/1998)
• Visually rating nitrogen sufficiency (7/1997)
• What about N credits following soybean? (6/1997)
• Corn planting after ammonia application (4/1995)
• Timing planting with anhydrous ammonia applications (4/1993)

Conference Proceedings and Reports

• Sawyer, J.E., J.P. Lundvall, and J.A. Hawkins. 2007. In-season nitrogen management for corn production. p. 38-45. 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.
• Sawyer, J., J. Lundvall, and J. Hawkins. 2007. Demonstration of in-season nitrogen management strategies for corn production. Final project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program. (pdf)
• Sawyer, J., J. Lundvall, and J. Hawkins. 2007. Demonstration of in-season nitrogen management strategies for corn production. Crop year 2006 project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program. (pdf)
• Sawyer, J.E. 2006. Managing nitrogen for high corn yields. p. 191-199. In Proc. 18th Annual Integrated Crop Manag. Conf., Ames, IA. 29-30 Nov. 2006. Iowa State Univ., Ames, IA. (pdf)
• Laboski, C.A.M., J.E. Sawyer, D.T. Walters, L.G. Bundy, R.G. Hoeft, G.W. Randall, and T.W. Andraski. 2006. Evaluation of the Illinois soil nitrogen test in the North Central region. p. 86-93. In Proc. Thirty-Sixth North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 7-8 Nov. 2006. Vol. 22. Potash & Phosphate Inst., Brookings, SD. (pdf)
• Mallarino, A.P., and E. Ortiz-Torres. 2006. A long-term look at crop rotation effects on corn yield and response to nitrogen fertilization. p. 209-217. In Proc. 18th  Annual Integrated Crop Manag. Conf., Ames, IA. 29-30 Nov. 2006. Iowa State Univ., Ames, IA. (pdf)
• Sawyer, J., J. Lundvall, J. Hawkins, and D. Barker. 2006. In-season sensing for nitrogen stress in corn. Developed for the in-season nitrogen management project, Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program. (pdf)
• Sawyer, J., J. Lundvall, and J. Hawkins. 2006. Demonstration of in-season nitrogen management strategies for corn production. Crop year 2005 project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program. (pdf)
• Mallarino, A.P., David Rueber, and E. Ortiz-Torres. 2006. Grain yield of corn, soybean, and oats as affected by crop rotation and nitrogen fertilization for corn. In annual progress reports-2005. Northern research and demonstration farm. ISRF05-22. Iowa State Univ., Ames, IA. (pdf)
• Sawyer, J.E., and E.D. Nafziger. 2005. Regional approach to making nitrogen rate decisions for corn. p. 16-24. In Proc. Thirty-Fifth North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 16-17 Nov. 2005. Vol. 21. Potash & Phosphate Inst., Brookings, SD. (pdf)
• Sawyer, J.E., and M. Al-Kaisi. 2005. Soil nitrogen and carbon management project. Final project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program. (pdf)
• Sawyer, J., J. Lundvall, and J. Hawkins. 2005. Demonstration of in-season nitrogen management strategies for corn production. Crop year 2004 project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program. (pdf)
• Barker, D.W., and J.E. Sawyer. 2005. Nitrogen application to soybean at early reproductive development. Agron. J. 97:615-619. (pdf)
• Sawyer, J.E. 2005. Does it pay to fertilize corn with nitrogen? In Proc. Agriculture and Environment Conf. 8-9 March. Iowa State Univ., Ames , IA (pdf)
• Mallarino, A.P., E. Ortiz-Torres, and K. Pecinovsky. 2005. Effects of crop rotation and nitrogen fertilization on crop production. p. 40-41. In Annual progress reports-2004. Northeast research and demonstration farm. ISRF04-13. Iowa State Univ., Ames, IA. (pdf)
• Sawyer, J.E. 2004. With high fertilizer prices is it business as usual or should fertilization practices change? p. 163 - 176. In Proc. 16th Annual Integrated Crop Manag. Conf., Ames , IA. 1-2 Dec. 2004. Iowa State Univ., Ames , IA.
• Nafziger, E.D., J.E. Sawyer, and R.G. Hoeft. 2004. (pdf) Formulating N recommendations in the corn belt using recent data. p. 5-11. In Proc. Thirty-Fourth North Central Extension-Industry Soil Fertility Conf., Des Moines , IA. 17-18 Nov. 2004. Vol. 20. Potash & Phosphate Inst., Brookings , SD. (pdf)
• Sawyer, J.E., D.W. Barker, and J.P. Lundvall. 2004. Using chlorophyll meter readings to determine N application rates for corn. p. 136-143. In Proc. Thirty-Fourth North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 17-18 Nov. 2004. Vol. 20. Potash & Phosphate Inst., Brookings , SD. (pdf)
• Sawyer, J.E., and M. Al-Kaisi. 2004. Soil nitrogen and carbon management project. In Proc. Agriculture and the Environment Conf. 1-2 March. Iowa State Univ., Ames, IA (pdf)
• Baker, J.L. 2004. Limitations of improved nitrogen management to reduce leaching and increase use efficiency. In Proc. Optimizing Nitrogen Management in Food and Energy Production and Environmental Protection, 2nd International Nitrogen Conf. on Science and Policy. The Scientific World 1(S2), 10-16. (pdf)
• Baker, J.L. 2004. In-field nutrient availability and balances, and potential implications on management systems to reduce losses. In Proc. Agriculture and the Environment Conf. 1-2 March. Iowa State Univ., Ames, IA (pdf)
• Kanwar, R., C. Pederson, J. Baker, A.P. Mallarino, J. Sawyer, and K. Pecinovsky. 2003. Fertilizer and swine manure management systems: Impacts on crop production and nitrate-nitrogen leaching with subsurface drainage. Annual progress reports-2002. Northeast Research and Demonstration farm. ISRF02-13. Iowa State Univ., Ames, IA. (pdf)
• Sawyer, J.E., D.W. Barker, J.P. Lundvall, and M. Al-Kaisi. 2003. Evaluation of the amino-sugar based soil test in Iowa corn production. p. 125-136. In Proc. Thirty-Third North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 19-20 Nov. 2003. Potash & Phosphate Inst., Brookings, SD. (pdf)
• Sawyer, J.E., D.W. Barker, and M. Al-Kaisi. 2003. Iowa experience with the Illinois N test. p. 46-54. In Proc. Wisconsin Fertilizer, Aglime and Pest Manag. Conf., Madison, WI. 21-23 Jan. 2003. Univ. of Wisc., Madison, WI. (pdf)
• Mallarino, A.P., and D. Rueber. 2002. Impacts of crop rotation and nitrogen fertilization on crop production. Annual progress reports-2001. Northern Research and Demonstration farm. ISRF01-22. Iowa State Univ., Ames, IA. (pdf)
• Boyd, P.M., H.M. Hanna, J.L. Baker, T.S. Colvin, and J.E. Sawyer. 2002. Field corn tests to examine anhydrous ammonia manifold variability. ASAE paper number 021024. St. Joseph MI, ASAE.
• Sawyer, J.E. and D. Barker. 2001. In-season nitrogen fertilization of soybean. p. 158-161. In Proc. Thirty First North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 14-15 Nov. 2001. Potash and Phosphate Inst., Brookings, SD. (pdf)
• Sawyer, J.E. 2001. Nitrogen fertilizer and swine manure application to soybean. p. 33-44. In. Proc. 13th Annual Integrated Crop Manag. Conf., Ames, IA. 5-6 Dec. 2001. Iowa State Univ., Ames, IA. (pdf)
• Sawyer, J.E. 2000. Nutrient Management - What’s Doable. p. 15-24. In Proc. Agriculture and the Environment Conf.: a wake up call for Iowans. 7-8 March. Iowa State Univ., Ames, IA. (pdf)
• 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)
• Sawyer, J.E. 1998. Managing crop nutrients and limestone with reduced financial resources. p. 33-36. In Proc. Integrated Crop Manag. Conf.. 17-18 Nov. Iowa State Univ., Ames, IA. (pdf)
• Hansen, D.J., A.M. Blackmer, and A.P. Mallarino. 1998. Optimizing nitrogen management in manured cornfields. p.121-126. In North Central Extension-Industry Soil Fertility Conference. Proceedings. Vol. 14. St. Louis, MO.
• West, C.P., and A.P. Mallarino. 1996. Nitrogen transfer from legumes to grasses. p. 167-175. In R.E. Joost and C.A. Roberts (eds.) Nutrient cycling in forage systems. Proceedings. March 7-8 Columbia, MO. Potash and Phosphate Institute and Foundation for Agronomic Research. Manhattan, KS.

Abstracts

• Hawkins, J.A., J.E. Sawyer, and J.P. Lundvall. 2005. Demonstration of in-season nitrogen management for corn production. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
• Kruse, M., M. Al-Kaisi, and J.E. Sawyer. 2003. Nitrogen management effect on soil carbon change and carbon dioxide release under a corn-soybean rotation. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
• Sawyer, J.E., D.W. Barker, and M. Al-Kaisi. 2003. Evaluation of the Illinois N soil test on Iowa soils. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
• Kruse, M.L., M. Al-Kaisi, and J.E. Sawyer. 2003. Nitrogen management effect on soil carbon dioxide emission. Iowa Academy of Sciences Annual Meeting, April 25-26, 2003, Des Moines, IA. Iowa Academy of Sciences, Cedar Falls, IA.
• Kruse, M.L., M. Al-Kaisi, and J.E. Sawyer. 2003. Nitrogen management effects on soil carbon dioxide emission. Fourth annual North Central Region Symposium on Natural Organic Matter in Soils and Water. March 21-22, 2003, Ames, IA. Iowa State Univ., Ames, IA.
• Sawyer, J.E. and D.W. Barker. 2000. In-season nitrogen fertilization of soybean. p. 286. In Agronomy abstracts, ASA, Madison, WI.
• Hansen, D.J, A.M. Blackmer, and A.P. Mallarino. 1996. Determining optimal rates of N fertilization for manured cornfields. p. 319. In Agronomy Abstracts, ASA, Madison, WI.
• Sawyer, J.E., and R.M. Vanden Heuvel. 1995. Preplant anhydrous ammonia knife spacing for corn production. p. 315. In Agronomy Abstracts, ASA, Madison, WI.
• Sawyer, J.E., L.E. Paul, S.A. Ebelhar, and R.G. Hoeft. 1991. Sidedress anhydrous ammonia knife spacing for corn production. p. 300. In Agronomy abstracts, ASA, Madison, WI.

Presentations

• Economics of nitrogen fertilization and influence of crop rotation. J.E. Sawyer. 2005 Iowa State University Crop Advantage Series meetings presentation (pdf)
• Soil nitrogen and carbon management project. Sawyer, J.E., and M. Al-Kaisi. 2004. Presented at the Agriculture and the Environment Conf. 1-2 March. Iowa State Univ., Ames, IA (pdf)

Links

• Corn Nitrogen Rate Calculator
• Rotation Profitability Calculator - Using Optimal Nitrogen Rate
• Rotation Profitability Calculator
• Yesterday - Iowa Average 4 Inch Soil Temperature Map
• Yesterday - Iowa Maximum/Minimum 4 Inch Soil Temperature Map
• Recent Iowa 4 Inch Soil Temperature Maps
• Natural Gas Spot Price
• ISU Research and Demonstration Farms Annual Progress Reports

 |Home Page| |Top of Page|