Implementing nitrogen management to protect Iowa's groundwater
Date
1993
Authors
Kohl, Kris
Melvin, Stewart
Hultgren, James
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Leopold Center for Sustainable Agriculture
The Leopold Center is a research and education center on the campus of Iowa State University created to identify and reduce negative environmental and social impacts of farming and develop new ways to farm profitably while conserving natural resources.
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Leopold Center for Sustainable Agriculture
Abstract
In agriculture, nitrogen (N) fertilizer recommendations historically have been based on the producer's yield goal. N supplied from legumes (soybeans and alfalfa) and manure is usually estimated conservatively to avoid any possible shortage. In Iowa, it has been generally assumed that N not used by the crop during a given growing season is denitrified (converted from nitrate, or NO3, to nitrite) or leached into the groundwater before the following growing season.