Microbial degradation of imazaquin and imazethapyr

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Abstract
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).