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Norflurazon adsorption and dissipation in three southern soils

Published online by Cambridge University Press:  12 June 2017

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

Norflurazon adsorption and dissipation under field and laboratory conditions, and distribution within the soil profile were determined in three soils representative of cotton-growing regions of the southeastern U.S. Norflurazon adsorption was greater in soil from 0 to 8 cm in a Lexington silt loam (Tennessee) and a Beulah silt loam (Mississippi) than in a Dothan loamy sand (Georgia). Adsorption was directly related to organic matter. Norflurazon degradation under controlled conditions in soil from 0 to 8 cm from each state was not different among locations, with half-lives ranging from 63 to 167 d. Degradation at 30 C in soil from the 30- to 45- and 60- to 90-cm depths was not different among locations, and was slower at the 60- to 90-cm depth than in surface soil. Norflurazon dissipation was more rapid under field conditions than under laboratory conditions, with half-lives ranging from 7 to 79 d in the 0- to 8-cm soil horizon. Dry field conditions slowed norflurazon dissipation. Norflurazon was not detected below 15 cm in the profile in any soil, and concentrations in the 8- to 15-cm soil zone were < 36 ppbw 112 d after treatment.

Keywords

Norflurazon, [4-chloro-5-(methylamino)-2-(3-(trifluoromethyl)phenyl)-3(2H)-pyridazinone]cotton, Gossypium hirsutum L.Degradationadsorptionleaching
Type
Soil, Air, and Water
Information
Weed Science , Volume 45 , Issue 2 , April 1997 , pp. 301 - 306
Copyright
Copyright © 1997 by the Weed Science Society of America 

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