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Published online 1 March 2008
Published in J Environ Qual 37:401-408 (2008)
DOI: 10.2134/jeq2006.0540
© 2008 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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Impact of Glyphosate-Tolerant Soybean and Glufosinate-Tolerant Corn Production on Herbicide Losses in Surface Runoff

Martin J. Shipitaloa,*, Robert W. Maloneb and Lloyd B. Owensa

a USDA-ARS, North Appalachian Experimental Watershed, P.O. Box 488, Coshocton, OH 43812-0488
b USDA-ARS, National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by USDA implies no approval of the product to the exclusion of others that may also be suitable


Figure 1
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  		Fig. 1. Relationship of glyphosate concentration to days after application for all three tillage treatments. Equation fit only to data for no-till watersheds.

 

Figure 2
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  		Fig. 2. Flow-weighted yearly average concentrations for three herbicides (and APMA, a decomposition product of glyphosate) applied during the four soybean crop years to no-till (NT), chiseled (CH), and disked (DS) watersheds. The average concentration is the arithmetic mean of the yearly flow-weighed averages for all tillage treatments.

 

Figure 3
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  		Fig. 3. Relationship of glufosinate concentration to days after application for all three tillage treatments. Equation fit only to data for the chisel and no-till watersheds.

 

Figure 4
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  		Fig. 4. Flow-weighted yearly average concentrations for the herbicides applied during the four corn crop years to no-till (NT), chiseled (CH), and disked (DS) watersheds. The average concentration is the arithmetic mean of the yearly flow-weighed averages for all tillage treatments.

 




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