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Sorption and Mobility of Bentazon in Coastal Plain Soils

Published online by Cambridge University Press:  12 June 2017

Timothy L. Grey ,
Glenn R. Wehtje ,
Ben F. Hajek  and
Robert H. Walker
Timothy L. Grey
Affiliation:
Dep. of Agron. and Soils, Alabama Agric. Exp. Stn., Auburn Univ. AL 36849
Glenn R. Wehtje
Affiliation:
Dep. of Agron. and Soils, Alabama Agric. Exp. Stn., Auburn Univ. AL 36849
Ben F. Hajek
Affiliation:
Dep. of Agron. and Soils, Alabama Agric. Exp. Stn., Auburn Univ. AL 36849
Robert H. Walker
Affiliation:
Dep. of Agron. and Soils, Alabama Agric. Exp. Stn., Auburn Univ. AL 36849
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Abstract

Sorption and mobility of 14C-bentazon were evaluated using soil solution and soil-thin-layer chromatography, respectively on three Coastal Plain soils. The proportion of bentazon adsorbed, was pH and concentration dependent and ranged between 28 to 47, 31 to 61, and 17 to 68% for the Dothan loamy sand, Greenville clay, and Troup loamy sand, respectively. Bentazon sorption decreased as soil pH increased from 5.4 to 5.8 on the Troup loamy sand, regardless of bentazon concentration. Sorption of 1 and 10 ppm bentazon decreased as soil pH increased from 5.0 to 5.7 on the Greenville clay and 6.1 to 6.4 on the Dothan loamy sand. Bentazon was least mobile on the Greenville clay and mobility increased as pH increased. Mobility of bentazon was greatest on the Troup loamy sand and was not pH dependent. Bentazon mobility decreased as soil pH increased for the Dothan loamy sand.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,l,3-benzothiadiazin-4-(3H)-one 2,2-dioxideSorptionleachingsoil sorption
Type
Soil, Air, and Water
Information
Weed Science , Volume 44 , Issue 1 , March 1996 , pp. 166 - 170
Copyright
Copyright © 1996 by the Weed Science Society of America 

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