Abstract: The degradation dynamics of different formulations of Abamectin in paddy soil and paddy water were studied. When the additive concentration was in the extent of 0.001-1 mg·kg-1, the average recovery varied from 87.3% to 98.4% with the coefficient of variation of 4.3%－8.2%,which was accord with the relevant standard of pesticide residue test. Experimental data suggested that with the recommended dose, the half\|time of EC of Abamectin was 2.6－2.7 d in soil, 2.7－4.5 d in paddy water at three testing places, and ME was 11.2－13.1 d in soil, 3.6－7.4 d in paddy water at three testing places. The results showed that the half-time of EC of Abamectin was longer than the half-time of ME in the same testing condition.

Key words: Abamectin, formulation, half-time, soil, water