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| Web URL(s): | http://www.bioone.org/bioone/?request=get-document&issn=0043-1745&volume=052&issue=01&page=0166
Last checked: 11/2005
Access conditions: Item is within a limited access website |
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| Publication Type:
| Refereed |
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| Author(s): | Krutz, Larry J.;
Senseman, Scott A.;
Dozier, Monty C.;
Hoffman, Dennis W.;
Tierney, Dennis P. |
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| Author Affiliation: | Krutz and Senseman: Department of Soil and Crop Science, Texas Agricultural Experiment Station, Texas A&M University, College Station, Texas; Dozier: Department of Soil and Crop Sciences, Texas Cooperative Extension, Texas A&M University, College Station, Texas; Hoffman: Blackland Research Center, Texas Agricultural Experiment Station, Temple, Texas; and Tierney: Environmental Stewardship and Regulatory Policy, Syngenta Crop Protection, Greensboro, North Carolina |
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| Title: | Infiltration and adsorption of dissolved metolachlor, metolachlor oxanilic acid, and metolachlor ethanesulfonic acid by buffalograss (Buchloe dactyloides) filter strips |
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| Section: | Soil, air, and water
Other records with the "Soil, air, and water" Section
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| Source: | Weed Science. Vol. 52, No. 1, January/February 2004, p. 166-171. |
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| Publishing Information: | Champaign, IL: Weed Science Society of America |
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| # of Pages: | 6 |
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| Keywords: | TIC Keywords: Infiltration; Adsorption; Metolachlor; Bouteloua dactyloides; Filter strips; Metabolites; Watersheds; Surface runoff
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| Abstract/Contents: | "Vegetative filter strips (VFS) potentially reduced herbicide transport from agricultural fields by increasing herbicide mass infiltrated (Minf) and herbicide mass adsorbed (Mas) compared with bare field soil. However, there are conflicting reports in the literature concerning the contribution of Mas to herbicide trapping efficiency (TE). Moreover, no study has evaluated TE among metolachlor and metolachlor metabolites in a VFS. This experiment was conducted to compare TE, Minf, and Mas among metolachlor, metolachlor oxanilic acid (OA), and metolachlor ethanesulfonic acid (ESA) in buffalograss filter strips. Runoff was applied as a point source upslope of a 1- X 3-m microwatershed at a rate of 750 L h-1. The point source was fortified with metolachlor, metolachlor OA, and metolachlor ESA, each at 0.12 μg ml-1. After moving through the plot, water samples were collected at 5-min intervals and stored at 5 C until analysis. Water samples were extracted using solid-phase extraction and analyzed by high-performance liquid chromatography-photodiode array detection. TE was significantly greater for metolachlor (25.3%) as compared with the OA (15.5%) and ESA metabolites (14.2%). The average Minf was 8.5% and was not significantly different among compounds. Significantly more metolachlor (17.3%) was retained as Mas compared with either metolachlor OA (7.0%) or metolachlor ESA (5.5%). Moreover, Mas accounted for 68 and 42% of the total TE for metolachlor and metolachlor metabolites, respectively. These results demonstrate that adsorption to the VFS grass, grass thatch, or soil surface (or all) is an important retention mechanism for metolachlor and metolachlor metabolites, especially under saturated conditions. Moreover, the Mas data indicate that metolachlor is preferentially retained by the VFS grass, grass thatch, or soil surface (or all) compared with the OA and ESA metabolites. Greater metolachlor retention in VFS compared with the OA and ESA metabolites may partially explain why metolachlor metabolites are frequently measured at higher concentrations than metolachlor is in surface water." |
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| Language: | English |
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| References: | 33 |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Krutz, L. J., S. A. Senseman, M. C. Dozier, D. W. Hoffman, and D. P. Tierney. 2004. Infiltration and adsorption of dissolved metolachlor, metolachlor oxanilic acid, and metolachlor ethanesulfonic acid by buffalograss (Buchloe dactyloides) filter strips. Weed Sci. 52(1):p. 166-171. |
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| Web URL(s):
http://www.bioone.org/bioone/?request=get-document&issn=0043-1745&volume=052&issue=01&page=0166
Last checked: 11/2005
Access conditions: Item is within a limited access website |
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MSU catalog number: SB 610 .W38 |
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