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Phytotoxicity and Adsorption of Chlorsulfuron as Affected by Soil Properties

Published online by Cambridge University Press:  12 June 2017

Wondimagegnehu Mersie  and
Chester L. Foy
Wondimagegnehu Mersie
Affiliation:
Dep. Plant Pathol., Physiol., and Weed Sci., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061
Chester L. Foy
Affiliation:
Dep. Plant Pathol., Physiol., and Weed Sci., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061
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Abstract

The phytotoxicity of chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl] benzenesulfonamide} was compared in six soils, and the relationship of activity to soil physical and chemical properties was evaluated. The influence of soil pH (4.2 to 7.8) on phytotoxicity and adsorption of chlorsulfuron incorporated into high-organic-matter soil was also studied. For the phytotoxicity studies, corn (Zea mays L. ‘Pioneer 3320’) was used as the bioassay plant. Organic matter was the soil variable most highly correlated with chlorsulfuron phytotoxicity. There was an inverse relationship between phytotoxicity and organic matter. No significant relationship between clay content and chlorsulfuron toxicity was observed. The adsorption of chlorsulfuron decreased with increasing soil pH while desorption was greater at alkaline pH. Phytotoxicity of chlorsulfuron increased with increasing soil pH and reached a maximum at pH 6.9.

Keywords

Soil organic mattersoil pHsoil clay contentbioassay
Type
Soil, Air, and Water
Information
Weed Science , Volume 33 , Issue 4 , July 1985 , pp. 564 - 568
Copyright
Copyright © 1985 by the Weed Science Society of America 

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