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Adsorption, dissipation, and movement of fluometuron in three southeastern United States soils

Published online by Cambridge University Press:  12 June 2017

William T. Willian ,
Thomas C. Mueller ,
Robert M. Hayes ,
Charles E. Snipes  and
David C. Bridges
William T. Willian
Affiliation:
Department of Plant and Soil Science, University of Tennessee, Knoxville, TN 37901
Robert M. Hayes
Affiliation:
Department of Plant and Soil Science, University of Tennessee, Knoxville, TN 37901
Charles E. Snipes
Affiliation:
Mississippi State University, Stoneville, MS
David C. Bridges
Affiliation:
University of Georgia, Griffin, GA
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Abstract

Fluometuron adsorption and dissipation under field and laboratory conditions, and distribution within the soil profile was determined in 3 soils from Tennessee, Mississippi, and Georgia that are representative of the cotton-growing regions of the southeastern United States. Fluometuron adsorption was correlated with organic matter, but not with clay content or soil pH. First-order kinetics explained fluometuron dissipation under field and controlled conditions (r2 ≥ 0.82). Field dissipation of fluometuron was slower under dry conditions. Fluometuron was not detected below 15 cm in the soil profile in any soil, and concentrations in the 8- to 15-cm soil zone were < 15 ppbw 112 d after treatment. Fluometuron dissipation was more rapid in soil from the 0- to 8-cm depth in Tennessee soil than in Mississippi soil under controlled conditions. Dissipation was more rapid under field conditions than under laboratory conditions at 2 of 3 locations. Fluometuron half-lives in soils from the 0- to 8-cm depth ranged from 9 to 28 d under field conditions and from 11 to 43 d in the laboratory. Fluometuron dissipation in soils from 30- to 45- and 60- to 90-cm depths was not different among soils, with half-lives ranging from 58 to 99 d under laboratory conditions. Fluometuron half-life was positively correlated with soil depth and inversely correlated with organic matter. These data indicate that organic matter, soil depth, and environmental conditions affect fluometuron dissipation.

Keywords

DegradationadsorptiondepthleachingFluometuron, N,N-dimethyl-N′-[3-(trifluoromethyl)pheny l]ureacotton, Gossypium hirsutum L.
Type
Soil, Air, and Water
Information
Weed Science , Volume 45 , Issue 1 , February 1997 , pp. 183 - 189
Copyright
Copyright © 1997 by the Weed Science Society of America 

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