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Effect of Thiazopyr on Soybean Growth and Dissipation in Soil

Published online by Cambridge University Press:  12 June 2017

Thomas C. Mueller  and
Robert M. Hayes
Thomas C. Mueller
Affiliation:
Dep. Plant and Soil Sci., Univ. Tennessee, Knoxville, TN 37901
Robert M. Hayes
Affiliation:
Dep. Plant and Soil Sci., Univ. Tennessee, Knoxville, TN 37901
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Abstract

Field studies indicated thiazopyr at 220 g ha−1 injured soybeans planted in no-till, and 340 g ha−1 injured soybean in 1 of 2 yr planted into tilled soil. Thiazopyr half-lives in three field studies ranged from 12 to 14 d, indicating minimal potential for carryover injury to sensitive rotational crops. Thiazopyr dissipation under controlled conditions was slower than under field conditions. Half-lives at 15 and 30 C were 133 and 43 d, respectively. This indicates that microbial degradation is an important mechanism in thiazopyr dissipation, but that other loss mechanisms also play a role. A method using methanol extraction of moist soil samples followed by gas chromatography using a nitrogen-phosphorous detector had > 90% recovery of thiazopyr.

Keywords

Soybeans (Glycine max L. Merr. ‘Essex’), thiazopyr (methyl 2-(difluoromethyl)-5-(4,5-dihydro-2-thiazolyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3-pyridinecarboxylate)Persistencetillagedegradationbioavailabilityanalytical methodMON 13200
Type
Soil, Air, and Water
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 694 - 697
Copyright
Copyright © 1996 by the Weed Science Society of America 

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References

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