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Title: FLUOMETURON ADSORPTION TO SOIL INFLUENCED BY BEST MANAGEMENT PRACTICES (BMPS) FILTER STRIPS AND RIPARIAN ZONES

Author
item SHANKLE, M - MISSISSIPPI STATE UNIV
item SHAW, D - MISSISSIPPI STATE UNIV
item KINGERY, W - MISSISSIPPI STATE UNIV
item Locke, Martin

Submitted to: American Chemical Society Symposium Series
Publication Type: Book / Chapter
Publication Acceptance Date: 7/1/2002
Publication Date: 3/1/2004
Citation: Shankle, M.W., Shaw, D.R., Kingery, W.L., Locke, M.A. 2004. Fluometuron adsorption to soil influenced by best management practices (bmps) filter strips and riparian zones. American Chemical Society Symposium Series 877. In: Nett, Mary T., Locke, Martin A., and Pennington, Dean A., editors. Water Quality Assessments in the Mississippi Delta. Oxford University Press, New Yor, NY. pp. 164-178.

Interpretive Summary: Management practices are needed to ensure that pollutant contamination of surface water resources is minimized. As part of the Mississippi Delta Management Systems Evaluation Area project, a study was conducted to assess soil properties and fluometuron binding to soil collected from a cropped watershed and adjacent filter strip and riparian forest in an area that drains into an oxbow lake. These evaluations determined that proper filter strip establishment and riparian zone management enhance the soil retention capacity for herbicides such as fluometuron. Therefore, adoption of these best management practices may help improve surface water quality by reducing herbicide mobility and allow the continued use of valuable herbicides in the Mississippi Delta.

Technical Abstract: A study was established to determine soil properties and fluometuron adsorption in a Dundee silt loam collected from a cropped watershed and adjacent filter strip epipedons (0-2 cm depth); and a Dowling overwash phase from a riparian forest epipedon. New (< 1 yr) and established (> 5 yr) grass filter strip sampling points include a mixing zone (1 m prior to strip edge, but not in cropped area), edge, 1 m, and 2 m into filter strip. Riparian forest sampling points include 0-25 m (riparian entrance), 50-200 m, and 400-800 m into the riparian area. Percent organic matter (OM), percent clay and cation exchange capacity (CEC) were higher with increasing distance down slope from the established filter strip mixing zone to 2 m into the strip ranging from 0.4% to 2.4%, 18% to 23%, and 12 to 18 cmol kg/**-1, respectively. In the riparian forest, OM, clay, and CEC ranged from 2.3% to 4.5%, 22% to 40%, and 18 to 32 cmol Kg**-1, respectively, with increasing distance down slope from channel entrance to 400-800 m from the entrance. Fluometuron adsorption to soil collected 1 and 2 m from the established grass filter strip edge and riparian areas was higher compared to established filter strip mixing zone and edge, all new filter strip areas, and adjacent cropped soil. Values of KD were positively correlated with OM and CEC (r > 95).