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Questions and Answers Regarding Nitrogen and Water Quality

Due to increased awareness of nutrient management and water quality, Iowa State University Extension and Outreach has received a number of questions about nitrogen movement from Iowa’s cropping systems into surface and subsurface water. The following frequently asked questions and answers have been prepared to clarify aspects of nitrogen management and nitrogen movement in the soil system.

Water Quality Talking Points

Corn Nitrogen Rate Calculator

Finding the Maximum Return To N and Most Profitable N Rate - A Regional (Corn Belt) Approach to Nitrogen Rate Guidelines - This web site provides a process to calculate economic return to N application with different nitrogen and corn prices and to find profitable N rates directly from recent N rate research data. The method used follows a newly developed regional approach for determining corn N rate guidelines that is being implemented in several Corn Belt states.