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Chlorsulfuron Adsorption and Degradation in Soil

Published online by Cambridge University Press:  12 June 2017

Kausalya Thirunarayanan ,
Robert L. Zimdahl  and
Darryl E. Smika
Kausalya Thirunarayanan
Affiliation:
Weed Res. Lab., Dep. Plant Pathol. and Weed Sci., Colorado State Univ., Ft. Collins, CO 80523
Robert L. Zimdahl
Affiliation:
Weed Res. Lab., Dep. Plant Pathol. and Weed Sci., Colorado State Univ., Ft. Collins, CO 80523
Darryl E. Smika
Affiliation:
Cent. Great Plains Res. Stn., Akron, CO 80720
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Abstract

Adsorption of chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl) amino] carbonyl] benzenesulfonamide} on four soils having different pH values (6.2 to 8.1) was low. Log/log Freundlich isotherms for all soils at 8 and 30 C were linear, the extent of adsorption being greater at 8 than at 30 C. There was an inverse relationship between pH and degradation rate with a half-life of 88.5 days at pH 6.2 and 144 days at pH 8.1 at 20 C. Rapid disappearance was noted during the first 15 days after application. With decreasing moisture and temperature, chlorsulfuron degraded more slowly. The half-life ranged from 229 days at 10 C and moisture content of 75% field capacity to 62.5 days at 40 C and 75% field capacity at pH 7.7.

Keywords

Soil moisturesoil temperaturesoil pH
Type
Soil, Air, and Water
Information
Weed Science , Volume 33 , Issue 4 , July 1985 , pp. 558 - 563
Copyright
Copyright © 1985 by the Weed Science Society of America 

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