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Degradation of Three Acetanilide Herbicides in Soil

Published online by Cambridge University Press:  12 June 2017

Robert L. Zimdahl  and
Susan K. Clark
Robert L. Zimdahl
Affiliation:
Weed Res. Lab., Dep. Bot. and Plant Pathol., Colorado State Univ., Ft. Collins, CO 80523
Susan K. Clark
Affiliation:
Weed Res. Lab., Dep. Bot. and Plant Pathol., Colorado State Univ., Ft. Collins, CO 80523
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Abstract

The persistence of alachlor [2-chloro-2′,6′-diethyl-N-(methoxymethyl) acetanilide], metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide], and propachlor (2-chloro-N-isopropylacetanilide) in soil was examined under laboratory and field conditions using sorghum (Sorghum vulgare Pers. ‘NB280S′) or annual ryegrass (Lolium multiflorum Lam.) as bioassay species. In laboratory studies, degradation rate of alachlor and propachlor was greater at 50 and 80% than at 20% field capacity at 20 C. Degradation of metolachlor was greater at 80 than at 20% field capacity. Degradation rate of alachlor and metolachlor at 50% field capacity was greater at higher temperatures. Propachlor degradation rate varied with temperature. Under irrigated, cropped field conditions, the order of persistence was metolachlor > alachlor > > propachlor.

Keywords

Soil moisturesoil temperaturealachlormetolachlorpropachlor
Type
Research Article
Information
Weed Science , Volume 30 , Issue 5 , September 1982 , pp. 545 - 548
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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