Abstract: After the paddy soil in the barrel was treated with different types of organic fertilizer, the solution of acetochlor with the concentration of 1.2 g/L was sprayed, and the soil samples were taken to detect the residue of acetochlor at different days (0.5, 1, 3, 5, 7, 14, 21, 30, 45 d). The half-lifes of acetochlor after different treatments were calculated, and the feasibility of degradation of acetochlor by fertilizer treatment was analyzed. The results showed that after the application of organic water-soluble fertilizer or microbial organic fertilizer, the half-life of acetochlor in soil was significantly shorter than that of the control. After PSBGH, the half-life of acetochlor was the shortest, which was 21.77% of that of the control. After the application of AWJL, the half-life of acetochlor was the longest in all treatments, which was 61.51% of the control. It was considered that the application of organic fertilizer could be used as an effective method to degrade acetochlor residues in paddy fields.

Key words: soil, acetochlor, degradation, humic acid, microbial organic fertilization