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Fate of Metribuzin, Metolachlor, and Fluometuron in Soil

Published online by Cambridge University Press:  12 June 2017

Dermont C. Bouchard ,
Terry L. Lavy  and
Dave B. Marx
Dermont C. Bouchard
Affiliation:
Altheimer Lab., Agron. Dep., Univ. of Arkansas; Fayetteville, AR 72701
Terry L. Lavy
Affiliation:
Altheimer Lab., Agron. Dep., Univ. of Arkansas; Fayetteville, AR 72701
Dave B. Marx
Affiliation:
Altheimer Lab., Agron. Dep., Univ. of Arkansas; Fayetteville, AR 72701
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Abstract

Adsorption of metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4H)-one], metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide] and fluometuron [1,1-dimethyl-3-(α,α,α-trifluoro-m-tolyl)urea] on a Taloka silt loam (Mollic Albaqualf) and a Roxana silt loam (Typic Udifluvent) from the 10- to 20- and 40- to 50-cm soil depths was measured. The order of adsorption of the herbicides was fluometuron = metolachlor > metribuzin. Adsorptivity of the soil from the 10- to 20-cm depth was greater than from the 40- to 50-cm depth. At 7, 15, 23, and 37C, all herbicides degraded more rapidly as temperature increased. Metribuzin was least persistent and fluometuron and metolachlor were similarly persistent. The time required for the initial herbicide concentration to decrease by 50% in the Taloka silt loam from the 10- to 20-cm depth at 23C was 2.6, 9.4, and 10.1 weeks for metribuzin, fluometuron, and metolachlor, respectively.

Keywords

Soil persistenceadsorptiondegradation
Type
Research Article
Information
Weed Science , Volume 30 , Issue 6 , November 1982 , pp. 629 - 632
Copyright
Copyright © 1982 by the Weed Science Society of America 

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