An Assessment of On-Farm Applications of the Late-Spring Soil Nitrate Test in Iowa, January 1994

(1994) An Assessment of On-Farm Applications of the Late-Spring Soil Nitrate Test in Iowa, January 1994. Natural Resources, Department of

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Abstract

Nitrogen fertilization is essential for profitable corn production in Iowa. Nitrogen is also a major cost of production and, when lost from the cropping system, contributes to environmental problems. Since 1982, the state of Iowa has implemented a large array of programs to improve the environmental performance of agriculture as part of lowa's Agricultural-Energy Environmental Initiative. Improved nitrogen (N) management has been one primary objective of the programs because of regional problems with nitrate contamination of water supplies that have evolved over time and because of the clear opportunities to enhance the efficiency and profitability of lowa farmers.