Kansas Water Science Center
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Transport and Degradation of Glyphosate in a Midwestern Tile-Drained Watershed, Sugar Creek, IndianaBy Michael Meyer, Jeffrey W. Frey, Edward A. Lee, Kathryn Kuivila, and Mark Sandstrom AbstractConcentrations of glyphosate and aminomethylphosphonic acid (AMPA) ranged from less than 0.01 to more than 400 ug/L in overland flow, tile-drain, surface-water, and wet deposition (rainfall) samples collected between May and September 2004 at a row-crop field planted in glyphosate-resistant soybeans. Concentrations of glyphosate and AMPA ranged from a maximum of approximately 20 to 450 and 3 to 30 ug/L, respectively, in overland-flow samples. Concentrations of glyphosate and AMPA ranged from less than 0.01 to 5 and 0.01 to 2.6 ug/L, respectively, in tile-drain samples and surface water from a drainage ditch adjacent to the farm. Glyphosate and AMPA were detected at concentrations of less than 2 ug/L in 11 wet deposition samples collected between May and September. Spatial and temporal variations in concentrations of glyphosate and AMPA also were observed in pre- and post-application 45-cm deep soil cores divided in 15-cm intervals. Meyer, M.T., Frey, J.W., Lee, E.A., Kuivila, Kathryn, and Sandstrom, Mark, 2005, Transport and degradation of glyphosate in a midwestern tile-drained watershed, Sugar Creek, Indiana [abst.]: 229th meeting of American Chemical Society, San Diego, California, March 13-17, 2005. Additional information about glyphosate studies by the Organic Geochemistry Research Group in Kansas can be found at: http://ks.water.usgs.gov/researchlab.html To request a paper copy of this abstract, email: mmeyer@usgs.gov |
U.S. Department of the Interior |
U.S. Geological Survey
URL: /pubs/abstracts/acs.mtm.2005.htm
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The USGS has collected hydrologic information in Kansas since 1895 with the first USGS Cooperative
Water Program funding agreement for 6 streamflow gages with the Kansas Water Board. USGS collects streamflow
and gage-height data; reservoir content; water-quality and water-quantity data; suspended-sediment data;
and groundwater levels. Hydrologic studies are conducted on national, regional, statewide, and local levels.
The USGS in Kansas works cooperatively with 31 Federal, State, and local agencies, such as the Kansas Water Office, the U.S.Army Corps of Engineers, and the City of Wichita