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Effect of Crop Presence on Persistence of Atrazine, Metribuzin, and Clomazone in Surface Soil

Published online by Cambridge University Press:  12 June 2017

Kent Gallaher  and
Thomas C. Mueller
Kent Gallaher
Affiliation:
P.O. Box 1071, Dep. of Plant and Soil Sci., Univ. Tennessee, Knoxville, TN 37901
Thomas C. Mueller
Affiliation:
P.O. Box 1071, Dep. of Plant and Soil Sci., Univ. Tennessee, Knoxville, TN 37901
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Abstract

Atrazine, metribuzin, and clomazone half-lives averaged over treatments and seasons were approximately 27, 22, and 55 d, respectively. Clomazone dissipation was not affected by the presence or absence of a soybean crop. Atrazine and metribuzin dissipation was not affected by crops in 1992, but was more rapid in no-crop plots than in cropped plots in 1993. The difference may have been the result of higher soil water content with no-crop (a few weeds present) in 1993 than either corn or soybean. Lower soil moisture may have slowed soil microbial activity, thus suppressing atrazine and metribuzin degradation in the 1993 growing season. Few significant correlations were found between herbicide half-life or herbicide concentration and cocklebur growth, although one would expect these to be an index of activity.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamineclomazone, 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinonemetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onecorn (Zea mays L.) ‘DeKalb DK689,’ soybean (Glycine max L. Merr.) ‘TN4-86,’ common cocklebur (Xanthium strumarium L.) ♯ XANSTDissipationbioassayHPLC
Type
Soil, Air, and Water
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 698 - 703
Copyright
Copyright © 1996 by the Weed Science Society of America 

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References

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