|RANSOM, CURTIS - University Of Missouri|
|CAMBERATO, JAMES - Purdue University|
|CARTER, PAUL - Dupont Pioneer Hi-Bred|
|FERGUSON, RICHARD - University Of Nebraska|
|FERNANDEZ, FABIAN - University Of Minnesota|
|FRANZEN, DAVID - North Dakota State University|
|LABOSKI, CARRIE A. - University Of Wisconsin|
|NAFZIGER, EMERSON - University Of Illinois|
|SAWYER, JOHN - Iowa State University|
|SHANAHAN, JOHN - Dupont Pioneer Hi-Bred|
Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/31/2015
Publication Date: 11/15/2015
Citation: Ransom, C.J., Kitchen, N.R., Camberato, J.J., Carter, P.R., Ferguson, R.B., Fernandez, F.G., Franzen, D.W., Laboski, C.M., Nafziger, E.D., Sawyer, J.E., Shanahan, J.F. 2015. Corn nitrogen fertilization rate tools compared over eight midwest states [abstract]. ASA-CSSA-SSSA Annual Meeting, November 15-18, 2015, Minneapolis, Minnesota. Paper No. 93024.
Technical Abstract: Publicly-available nitrogen (N) rate recommendation tools are utilized to help maximize yield in corn production. These tools often fail both when N is over-applied and result in excess N being lost to the environment, or when N is under-applied and the result in decreased yield and economic returns. Performance of a tool is often evaluated for specific soil and weather conditions of a growing season. Research is needed to determine which tools are the most effective at recommending economical optimal N rates (EONR) under varying soil and weather conditions. Research on N response plots is ongoing to evaluate publically-available recommendation tools across eight Midwest states. This presentation will summarize 2014 research. Two sites from each state, resulting in a range of historically productive sites, were used to evaluate differences in soil and weather environments. Performances of publicly-available tools for making N fertilizer recommendations are contrasted in this presentation. Tools to be compared include pre-plant soil nitrate test, pre-sidedress soil nitrate test, maximum return to N test (MRTN), and the Maize-N crop model. Analysis will include tool performance for each site-specific soil and weather environments as well as the universality of each tool.