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Adsorption, Desorption, and Mobility of Metolachlor in Soils

Published online by Cambridge University Press:  12 June 2017

T. Obrigawitch ,
F. M. Hons ,
J. R. Abernathy  and
J. R. Gipson
T. Obrigawitch
Affiliation:
Dep. Plant and Soil Sci., Texas Tech Univ., Lubbock, TX 79409
F. M. Hons
Affiliation:
Dep. Plant and Soil Sci., Texas Tech Univ., Lubbock, TX 79409
J. R. Abernathy
Affiliation:
Texas Agric. Exp. Stn., Lubbock, TX 79401
J. R. Gipson
Affiliation:
Dep. Plant and Soil Sci., Texas Tech Univ., Lubbock, TX 79409
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Abstract

Metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide] has considerable potential for yellow nutsedge (Cyperus esculentus L.) control in crops commonly produced in the Texas High Plains. Little information is available, however, concerning adsorption characteristics of metolachlor in soils of this region. Adsorption and movement of metolachlor were determined in three commonly occurring soils of the Texas High Plains. Organic carbon contents of the soils by weight varied from 0.3 to 0.5%, and the clay fraction ranged from 16 to 33%. Freundlich adsorption isotherms exhibited two linear regions for each soil, suggesting the possibility of multilayer adsorption. K′oc values and coefficients of determination for organic carbon and clay content vs. Freundlich K values indicated that organic matter was the predominant adsorbent for metolachlor in the soils studied. Desorption, soil column leaching, and thin-layer plate studies demonstrated metolachlor to be sufficiently mobile in scils low in organic matter to cause possible crop injury or loss of efficacy.

Keywords

Soilherbicideleachabilityacetanilide
Type
Research Article
Information
Weed Science , Volume 29 , Issue 3 , May 1981 , pp. 332 - 336
Copyright
Copyright © Weed Science Society of America 

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References

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