Nitrogen (N) in fall-applied manure can be lost by leaching and denitrification before crops start to grow in the spring. Although such losses were substantial during the past 2 years, it could be costly to assume that similar losses will occur this year. A more practical approach to handling N fertilization needs is to withhold applications of commercially prepared N fertilizers until fields are tested for nitrate in late spring. This approach makes it possible to adjust fertilization practices for weather.
Iowa State University
Blackmer, Alfred M., "Hold nitrogen on manured cornfields in 2000" (2000). Integrated Crop Management News. 2062.
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