Effects of Spent Mushroom Compost on Degradation of Imidacloprid in Soil and Plant

The changes of imidacloprid content in contaminated soil and tomato plants were studied when the Spent mushroom compost(SMC) was added as environmental remediation material. Tomato planting experiment was carried out by applying SMC and chicken dung to soil containing imidacloprid at a ratio of 1:1, 0:1 and 1:0. A HPLC method was developed for the determination of imidacloprid in soil and tomato plants. The result is that the degradation rate of imidacloprid in the soil of SMC as substrate is faster, and its half-life is 11.2 days. The SMC have certain adsorption effect to imidacloprid, makes the imidacloprid content in tomato plants grown on the basis of SMC is lower. Thus the SMC can effectively promote the process of adsorption and degradation of imidacloprid in the soil.