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The Degradation and Bioactivity of Metolachlor in the Soil

Published online by Cambridge University Press:  12 June 2017

Michael P. Braverman ,
Terry L. Lavy  and
Clyde J. Barnes
Michael P. Braverman
Affiliation:
Univ. Arkansas, Fayetteville, AR 72701
Terry L. Lavy
Affiliation:
Univ. Arkansas, Fayetteville, AR 72701
Clyde J. Barnes
Affiliation:
Univ. Arkansas, Fayetteville, AR 72701
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Abstract

In bioassays, rice (Oryza sativa L.) recovery from metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide] injury tended to be slower in flooded rice, but was not significantly different from the recovery rate in a nonflooded rice. In soils treated with 1 ppm (w/w) metolachlor and incubated in constant-temperature chambers, the half-life of metolachlor was shorter at 40 C than at 30 C. The degradation rate of metolachlor was not significantly correlated with declining moisture potentials in the range of −30 to −80 kPa. The CO2 evolution from metolachlor-treated soil was negatively correlated with incubation time and positively correlated to declining moisture levels. In a field study, metolachlor, as determined by bioassay, was mobile in a Taloka silt loam soil profile. After being incorporated to 7.5 cm, it became evenly distributed in the top 15 cm of the soil profile within 18 days. Metolachlor adsorption was positively correlated with clay and organic carbon content.

Keywords

Bioassayriceleachingmicrobial activity
Type
Soil, Air, and Water
Information
Weed Science , Volume 34 , Issue 3 , May 1986 , pp. 479 - 484
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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