The effects of dimethoate on the microbial populations and the growth of ascendent bacteria, funguses and actinomyces in soil at three different concentrations were studied by indoor culture method.

• 采用室内培养法研究了乐果在3种不同质量分数下对土壤微生物种群数量以及土壤中占优势的细菌、真菌和放线菌生长速率的影响。