菌株DLL-1降解土壤和韭菜中甲基对硫磷的研究

施甲基对硫磷7．5、15和22．5kg·hm^-2(a．i．)时，韭菜中最终平均农药残留量为0．633、1．270和1．901mg·kg^-1，自然降解率分别为98．94％、96．44％和96．04％．施用高效农药残留降解菌剂能显著地降低农药残留的含量，施用75kg·hm^-2降解菌剂时，韭菜与土壤中平均农药残留量分别为0．269、0．099mg·kg^-1，与不施菌对照相比，能使农药进一步降低78．82％和98．68％．降解率随着菌剂用量增加而升高，当用量超过75kg·hm^-2时降解率不再提高．菌剂施用时间以施药后3d为最好．

Degradation of methyl parathion in soil and Chinese chive by strain DLL-1

Degradation of methyl parathion in soil and Chinese chive by strain DLL-1 was studied. Usage of methyl parathion at 7.5, 15, and 22.5 kg(a.i.).hm-2 resulted in the average amount of residue of 0.663, 1.270, and 1.901 mg.kg-1 in Chinese chive respectively. The natural degradation rate was 98.94%, 96.44%, and 96.04% corresponding to the 3 levels of usage. The amount of pesticide residue could be significantly decreased through the application of high effective degrading microbial agents. The amount of pesticide residue in Chinese chive and soil was 0.269 and 0.099 mg.kg-1 with the usage of 75 kg.hm-2 of degradation bacterium, which was decreased by 78.82% and 98.68% compared with the control. Increasing the bacterium usage led to the increase of degradation rate. Usage of degradation bacterium more than 75 kg.hm-2 did not increase the degradation rate further. The best time of the application of the degrading microbe was 3 days after the application of the pesticide.