60-16 Corn Nitrogen Fertilization Rate Tools Compared over Eight Midwest States.

See more from this Division: SSSA Division: Soil Fertility and Plant Nutrition
See more from this Session: S4/S8 Ph.D. Oral Competition

Monday, November 7, 2016: 3:20 PM
Phoenix Convention Center North, Room 129 A

Curtis Ransom, Plant, Insect, and Microbial Sciences, University of Missouri, Columbia, MO, Gregory Mac Bean, Plant, Insect and Microbial Sciences, University of Missouri, Columbia, MO, Newell R Kitchen, 243 Agricultural Engineering Bldg, USDA-ARS, Columbia, MO, James J. Camberato, Agronomy, Purdue University, West Lafayette, IN, Paul R. Carter, DuPont Pioneer, Johnston, IA, Richard B. Ferguson, Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, NE, Fabián G. Fernández, Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN, David W. Franzen, North Dakota State University, Fargo, ND, Carrie A.M. Laboski, 1525 Observatory Drive, University of Wisconsin-Madison, Madison, WI, Emerson D. Nafziger, Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, John E. Sawyer, Department of Agronomy, Iowa State University, Ames, IA and John Shanahan, P & G Farms, Lincoln, NE
Abstract:
Publicly-available nitrogen (N) rate recommendation tools are utilized to help maximize yield in corn production. These tools often fail when N is over-applied and results in excess N being lost to the environment, or when N is under-applied and results in decreased yield and economic returns. Performance of a tool is often based on the 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 and 2015 research. Two sites from each state, resulting in a range of historically productive sites, were used to evaluate differences in soil and weather environments. Performance 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 (MRTN), and the Maize-N crop model. Analysis will include tool performance by site-specific soil and weather environments to understand the universality of each tool.

See more from this Division: SSSA Division: Soil Fertility and Plant Nutrition
See more from this Session: S4/S8 Ph.D. Oral Competition