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Each Year more than 10 billion kg of nitrogen fertilizer are applied to croplands in the United States at a cost of more that $3.5 billion (USDA Economics and Statistics System, 1998). It is estimated that the efficiency of this applied nitrogen (N) ranges from about 30% to about 70% (Pilbeam, 1998); thus, large amounts of fertilizer N are lost or wasted each year.
The Nitrogen Decision Aid is a computerized program that predicts the amount of N mineralized from planting to side-dress or 5-leaf growth-stage. By applying just enough N-fertilizer to reach the critical soil nitrate concentration it is possible reduce this waste. This model is designed for Northern climates that will have some frost in the soil during the winter.
The resulting output from the Nitrogen Decision Aid should be used as a guide to assist the user in making Nitrogen Management decisions. The USDA - ARS is not liable for any damages resulting from the use or misuse of the Nitrogen Model, its output and its accompanying documentation. |
Contributors:
Science: | |
| Dr. Alan Olness : Lead Scientist Soil Scientist USDA-ARS North Central Soil Conservation Research Laboratory 803 Iowa Avenue Morris, MN 56267 | Ward B. Voorhees Soil Scientist, Research Leader and Location Coordinator USDA-ARS North Central Soil Conservation Research Laboratory 803 Iowa Avenue Morris, MN 56267 |
| Dr. David Archer Agricultural Economist USDA-ARS North Central Soil Conservation Research Laboratory 803 Iowa Avenue Morris, MN 56267 | |
Computer Programming | |
| Dr. Dian Lopez Computer Scientist University of Minnesota Morris 600 E 4 Street Morris, MN 56267 | Jason Cordes Computer Programming Student University of Minnesota Morris 600 E 4 Street Morris, MN 56267 |
| Colin Sweeney Computer Programming Student University of Minnesota Morris 600 E 4 Street Morris, MN 56267 | Neil Mattson Computer Programming Student University of Minnesota Morris 600 E 4 Street Morris, MN 56267 |
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