Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn, April 2006

(2006) Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn, April 2006. Iowa State University Extension


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Nitrogen (N) is typically one of the largest corn fertilization expenses. Nitrogen application is critical because it signifi cantly improves corn yield in many crop rotations. When choosing N rates, producers need to carefully consider both achieving most profi table economic return and advancing environmental stewardship. In 2004, university agronomists from the Corn Belt states began discussions regarding N rate use for corn production. The reasons for the discussions centered on apparent differences in methods for determining N rates across states, misperceptions regarding N rate guidelines, and concerns about application rates as corn yields have climbed to historic levels. An outcome of those discussions was an effort with the objectives to: ▪ develop N rate guidelines that could be applicable on a regional basis and ▪ identify the most profi table fertilizer N rates for corn production across the Corn Belt. This publication provides an overview of corn N fertilization in regard to rate of application, investigates concepts for determining economic application rates, and describes a suggested regional approach for developing corn N rate guidelines directly from recent research data.

Item Type: Departmental Report
Keywords: Crom, Yields, Crops, nitrogen
Subjects: Agriculture and food production > Crops
Agriculture and food production > Crops > Corn
Agriculture and food production
ID Code: 3847
Deposited By: Margaret Barr
Deposited On: 11 Jul 2006
Last Modified: 11 Jul 2006