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Research ArticleResearch Section

Crop rotation and Raccoon River nitrate

C.S. Jones, A. Seeman, P.M. Kyveryga, K.E. Schilling, A. Kiel, K.-S. Chan and C.F. Wolter
Journal of Soil and Water Conservation May 2016, 71 (3) 206-219; DOI: https://doi.org/10.2489/jswc.71.3.206
C.S. Jones
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A. Seeman
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P.M. Kyveryga
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K.E. Schilling
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A. Kiel
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K.-S. Chan
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C.F. Wolter
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Abstract

Previous research predicted that the biofuel-driven expansion of corn (Zea mays L.) area would increase riverine export of nitrate-nitrogen (NO3-N) in the Mississippi River Basin. Accurate information about water quality trends in agricultural watersheds is needed to better inform agricultural policy and to help quantify the effectiveness of field and landscape management practices. This study was designed to (1) characterize possible NO3-N trends within the Raccoon River watershed (RRWS) of central Iowa, and (2) explore links between the relative areas planted to corn and soybean (Glycine max) and water quality. We examined NO3-N concentration and loading data from more than 60 main stem river and tributary locations in the RRWS for the period 1999 to 2014. In addition, we assessed the role of climate, crop rotations, and simplified annual N budgets on NO3-N concentrations and loads to show that expansion of corn area has not increased Raccoon River NO3-N levels. Nitrate-N concentrations have not increased as corn area increased 19% and fertilizer N inputs increased 24% since 1999. We conclude that expansion of corn area at the expense of soybean may be affecting water quality. Better management of soybean in a corn–soybean rotation should reduce NO3-N export from the watershed, and reducing throughput of water in this artificially drained system will improve water quality.

  • © 2016 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 71 (3)
Journal of Soil and Water Conservation
Vol. 71, Issue 3
May/June 2016
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Crop rotation and Raccoon River nitrate
C.S. Jones, A. Seeman, P.M. Kyveryga, K.E. Schilling, A. Kiel, K.-S. Chan, C.F. Wolter
Journal of Soil and Water Conservation May 2016, 71 (3) 206-219; DOI: 10.2489/jswc.71.3.206

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Crop rotation and Raccoon River nitrate
C.S. Jones, A. Seeman, P.M. Kyveryga, K.E. Schilling, A. Kiel, K.-S. Chan, C.F. Wolter
Journal of Soil and Water Conservation May 2016, 71 (3) 206-219; DOI: 10.2489/jswc.71.3.206
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