Effect of pH on Degradation of Chlorsulfuron in Soil

Growth of sorghum was more at low pH (5.1) soil than at high pH (8.1) soil at all concentrations of sulfosulfuron and incubation periods. Root dry weight per plant was 44%, highcr in low pH soil than under high pH soil. Visual phytotoxicity increased with increase in sullosulfuron conccntration and decreased with increase in incubation period in both the types of soil. After 120 days of incubation, GR 50 of sulfosulfuron increased approximately by 19.8 times in low pH soil as compared to only 7.8 times in high pH soil. Half life of sulfosulfuron was 28 days in high pH soil as compared to 11 days in low pH soil. After 120 days, 5 and 14% of the herbicide remained in low and high pH soil, respectively.