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Degradation of Chlorsulfuron by Soil Microorganisms

Published online by Cambridge University Press:  12 June 2017

Madan M. Joshi ,
Hugh M. Brown  and
James A. Romesser
Madan M. Joshi
Affiliation:
Agric. Prod., and Central Res. and Development Dep., Exp. Stn., E. I. Du Pont de Nemours & Co., Inc., Wilmington, DE 19898
Hugh M. Brown
Affiliation:
Agric. Prod., and Central Res. and Development Dep., Exp. Stn., E. I. Du Pont de Nemours & Co., Inc., Wilmington, DE 19898
James A. Romesser
Affiliation:
Agric. Prod., and Central Res. and Development Dep., Exp. Stn., E. I. Du Pont de Nemours & Co., Inc., Wilmington, DE 19898
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Abstract

Degradation of chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-yl)amino] carbonyl] benzenesulfonamide} in acidic and alkaline soils was evaluated using plant bioassay and high-performance liquid chromatography (HPLC) radiotracer techniques. Soil sterilization with either ethylene oxide (Et0) or gamma irradiation significantly reduced breakdown of chlorsulfuron; the ability for degradation was restored by reinoculation with indigenous soil microorganisms. Streptomyces griseolus (a soil actinomycete), Aspergillus niger, and Penicillium sp. (soil fungi) were demonstrated to degrade 14C-chlorsulfuron in pure culture. In addition to microbial breakdown, chemical hydrolysis was an important factor in the disappearance of chlorsulfuron from soil. The contribution of chemical hydrolysis to total degradation was a function of soil pH, with hydrolysis occurring most rapidly in acidic soils. Both dissipation processes slowed markedly at low temperatures.

Keywords

Soil pHsoil temperaturesoil moistureStreptomyces griseolusAspergillus nigerPenicillium sp
Type
Soil, Air, and Water
Information
Weed Science , Volume 33 , Issue 6 , November 1985 , pp. 888 - 893
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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