In Vitro Dissipation of Quizalofop-P-ethyl in Water and Soil

In vitro dissipation of quizalofop-P-ethyl in neutral, acidic and basic water and four different types of soils at 0.5 and 1.0 ppm levels of fortification revealed a faster rate of herbicide degradation in neutral and basic waters and the residue reached below determination level (BDL) of 0.01 μg mL−1 on the 3rd day with half-life ranging from 0.46 to 0.55 days. The rate of degradation was much slower in acidic water where the residues reached below determination level on the 30th day with half-life ranging from 2.64–2.68 days. In a micro-plot study the herbicide showed a biphasic mode of dissipation in four different types of soil with half-life ranging from 0.16 to 0.57 days and 2.05–4.0 days for the two phases, respectively. The rate of dissipation was maximum in red soil followed by sandy loam, black and clayey soils.