Degradation and Field Persistence of Imazethapyr

Author:

Goetz Andrew J.,Lavy Terry L.,Gbur Edward E.

Abstract

The volatilization, photolysis, microbial degradation, and field persistence of imazethapyr were studied using formulated and14C-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-labeled14C-imazethapyr. The amount of14CO2evolution from soil treated with either ring- or chain-labeled14C-imazethapyr was not significantly different. The total14CO2evolved from the soils ranged from 2.4 to 3.6% of the total14C-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 applied14C-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.

Publisher

Cambridge University Press (CUP)

Subject

Plant Science,Agronomy and Crop Science

Reference11 articles.

1. Microbial and photolytic dissipation of imazaquin in soil;Basham;Weed Sci.,1987

2. Measurement and prediction of picloram disappearance rates from soil;Meikle;Weed Sci.,1973

3. Goetz A. J. and Lavy T. L. 1990. Imazethapyr and imazaquin soil mobility and adsorption by soil, synthetic adsorbents, and iron minerals. J. Environ. Qual. (submitted).

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