Soil Persistence of Diuron Applied to Cotton Cultivation in Red and Black Soils

Persistence of diuron applied to cotton as preemergence spray at varied rates of application (0.5, 0.75, 1.0 kg ha-1) was studied in field experiments conducted simultaneously in red and black soils at Professor Jayashankar Telangana State Agricultural University, Rajendranagar during kharif, 2018. In both red and black soils, persistence of diuron was observed beyond 120 days after application and the concentration of diuron in the top soil (0-15 cm) was higher in black soils compared to red soils from 0 Days to 120 Days. Higher dose of diuron showed greater soil persistence in both red and black soil. Diuron dissipation in soil followed first order kinetics in both the soils. Field half life of diuron was higher in black soil was 53.3-77.0 days at different rates of application than in red soil (53.3-69.3 days).