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Degradation and Field Persistence of Imazethapyr

Published online by Cambridge University Press:  12 June 2017

Andrew J. Goetz ,
Terry L. Lavy  and
Edward E. Gbur Jr.
Andrew J. Goetz
Affiliation:
Dep. Agron. Univ. Arkansas, Fayetteville, AR 72701
Terry L. Lavy
Affiliation:
Dep. Agron. Univ. Arkansas, Fayetteville, AR 72701
Edward E. Gbur Jr.
Affiliation:
Agric. Statistics Lab. Univ. Arkansas, Fayetteville, AR 72701
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Abstract

The volatilization, photolysis, microbial degradation, and field persistence of imazethapyr were studied using formulated and 14C-labeled imazethapyr. Volatilization losses from soil were less than 2%. Photodecomposition losses of up to 8% occurred from soil and up to 52% from a glass slide with no soil. Significantly greater photodecomposition occurred with chain-labeled than ring-labeled 14C-imazethapyr. The amount of 14CO2 evolution from soil treated with either ring- or chain-labeled 14C-imazethapyr was not significantly different. The total 14CO2 evolved from the soils ranged from 2.4 to 3.6% of the total 14C-imazethapyr applied to the soil. However, degradation of imazethapyr from the same soils, as determined by high-pressure liquid chromatography, indicated that 62 to 82% of the applied 14C-imazethapyr had been degraded. The degradation rate increased as soil moisture was increased from −100 to −33 kPa. Imazethapyr was more persistent in soil with the higher clay and organic matter content.

Keywords

Imazethapyr(±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidPhotodecompositionvolatilizationmicrobial degradationsoil moisturetemperature
Type
Soil, Air, and Water
Information
Weed Science , Volume 38 , Issue 4-5 , September 1990 , pp. 421 - 428
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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