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Communication at the NABS Annual meeting, Keystone, 2000
(450) COUNTY-LEVEL NUTRIENT ANALYSIS FOR NONPOINT SOURCE ASSESSMENT.
R.D. Tejral1, D.E. Storm1, M.D. Smolen1, and P.L. Kenkel2. 1Oklahoma State University, Department of Biosystems and Agricultural Engineering, 2Oklahoma State University, Department of Agricultural Economics
This analysis will help to develop and implement water quality programs addressing nutrient imbalances and minimizing off-site water quality impacts from agricultural non point sources. Mass balances for nitrogen and phosphorus were performed at the county level for the State of Oklahoma. The import and export of nitrogen and phosphorus in the forms of major agricultural products were assessed for a ten-year period from 1987 through 1996. Data for grain and animal production were obtained from the 1987, 1992, and 1997 U.S. Censuses of Agriculture and annual bulletins from the Oklahoma Agricultural Statistics Service. Surplus or deficit nutrients were estimated for each county. Examining high nutrient imbalance counties in conjunction with information on cropping and livestock practices led to conclusions regarding the source and possible solutions to imbalances. For the State of Oklahoma, the mass balance was dominated by import of fertilizers and the resulting export of grain. Nutrients applied as commercial fertilizers greatly exceeded the output from grain production. However for some counties the movement of nutrients due to cropping activity is eclipsed by the influence of animal agriculture. This was evident in the easternmost counties where the poultry industry is growing while opportunities for grain production were low.
Presented at 1:00 PM on Wednesday, May 31, 2000 in Landscape Perspectives
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