Microbial degradation of imazaquin and imazethapyr

Weed Science - Tập 45 Số 4 - Trang 586-591 - 1997
Jerry L. Flint1, William W. Witt
1Department of Agronomy, University of Kentucky, Lexington, KY 40546

Tóm tắt

Laboratory studies were conducted to investigate the processes of imazaquin and imazethapyr degradation in soil. Microbial degradation of14C-imazaquin and14C-imazethapyr was monitored by measuring14CO2evolution compared to nonsterile soil.14CO2evolution was greatest from carboxyl-labeled imazaquin and imazethapyr compared to ring-labeled imazaquin and imazethapyr. A corn root bioassay indicated nearly complete loss of herbicidal activity in nonsterile soil after 5 mo, but herbicide activity was reduced only 14% in sterile soil.14CO2evolution more than doubled when soil temperature increased from 15 to 30 C. Total CO2production responded similarly. Degradation of imazaquin and imazethapyr increased as soil moisture increased from 15% (-2.4 MPa) to 75% of field capacity (-0.03 MPa).

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Weed Science

Tập 45 Số 4

586-591

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