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Sorption and Mobility of Sulfometuron and Imazapyr in Five Alabama Soils

Published online by Cambridge University Press:  12 June 2017

Glenn Wehtje ,
Ray Dickens ,
John W. Wilcut  and
Ben F. Hajek
Glenn Wehtje
Affiliation:
Dep. Agron. and Soils, Auburn Univ., AL 36849
Ray Dickens
Affiliation:
Dep. Agron. and Soils, Auburn Univ., AL 36849
John W. Wilcut
Affiliation:
Dep. Agron. and Soils, Auburn Univ., AL 36849
Ben F. Hajek
Affiliation:
Dep. Agron. and Soils, Auburn Univ., AL 36849
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Abstract

Mobility and sorption of radiolabeled sulfometuron {2-[[[[(4,6-dimethyl-2-pyrimidinyl)amino] carbonyl] amino] sulfonyl] benzoic acid} and imazapyr {(±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-pyridinecarboxylic acid} were evaluated in five soils representative of the major soil types in Alabama. Thin-layer soil chromatography indicated that sulfometuron was slightly more mobile (average Rf = 0.86) than imazapyr (average Rf = 0.79). Sulfometuron was more subject to sorption (average kd = 0.29) than imazapyr (average kd = 0.09) in batch equilibrium experiments. Least sorption of both herbicides occurred on clay soils, and maximum sorption occurred on a sandy clay. Similar results were obtained with a soil solution recovery technique. Sorption of both herbicides was exhanced by temporary reduction in soil water content and by lowering soil pH. The pH response of imazapyr was greater than that of sulfometuron.

Keywords

Sorptionherbicide leachingatrazinemetribuzin
Type
Soil, Air, and Water
Information
Weed Science , Volume 35 , Issue 6 , November 1987 , pp. 858 - 864
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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