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Science 24 December 1971:
Vol. 174. no. 4016, pp. 1331 - 1334
DOI: 10.1126/science.174.4016.1331
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Articles

Fertilizer Nitrogen: Contribution to Nitrate in Surface Water in a Corn Belt Watershed

Daniel H. Kohl 1, Georgia B. Shearer 1, and Barry Commoner 1

1 Center for the Biology of Natural Systems,Washington University, St.Louis, Missouri 63130

Measurements of nitrate concentration and relative enrichment in nitrogen-15 were made on samples of the surface waters of a typical Illinois corn belt watershed and the effluent of the subterranean tiles that drain the cropped land in the region. From these measurements, we estimate that at the time of peak nitrate concentration in the spring of 1970 a minimum of 55 to 60 percent of the nitrogen found as nitrate in the surface waters of this watershed originated from fertilizer nitrogen


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Evaluation of the ADAPT Model for Simulating Nitrogen Dynamics in a Tile-Drained Agricultural Watershed in Central Illinois..
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Isotopic Evidence of Nitrate Sources and Denitrification in the Mississippi River, Illinois.
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Organic Farming in the Corn Belt.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)