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Published online 27 October 2006
Published in J Environ Qual 35:2186-2194 (2006)
DOI: 10.2134/jeq2005.0476
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Tillage System, Application Rate, and Extreme Event Effects on Herbicide Losses in Surface Runoff

Martin J. Shipitalo* and Lloyd B. Owens

USDA–Agricultural Research Service, North Appalachian Experimental Watershed, P.O. Box 488, Coshocton, OH 43812-0488


Figure 1
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  		Fig. 1. Relationship of flow-weighted atrazine concentration in individual runoff events to days after application for all seven watersheds for the 9-yr period. MCL is maximum contaminant level.

 

Figure 2
Figure 2
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  		Fig. 2. Yearly, flow-weighted, average concentrations of alachlor, atrazine, linuron, and metribuzin in runoff from the chisel-tilled, no-till, and reduced-input watersheds. Since alachlor was applied in corn and soybean crop years, there are two averages for each year for this herbicide, but only one average per year for the others. HAL is health advisory level, MCL is maximum contaminant level.

 




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