Pesticides to protect crops from pests are subject to rigorous risk assessment before registration in Japan. However, further information needs to be collected regarding the assessment of impacts on the natural environment. In particular, nitrifying bacteria play a role in converting ammonium salts to nitrates in soil. However, there is limited research covering the effects of insecticides on nitrification, despite several fungicides and herbicides have an inhibitory effect on nitrifying bacteria. Therefore, we investigated the effect of pesticides on the nitrification when applied to soil. The application of both pesticides promoted ammonia oxidation, and suppressed nitrite oxidation in a high-concentration treatment of dinotefuran. In addition, it was clarified that the diversity and species richness of soil bacteria was significantly reduced when the pesticides were applied to the soil, and that the specific soil bacteria (Metyhlotenera spp.) dominated the application of the pesticides.

保护农作物免受害虫侵害的农药在日本注册之前要经过严格的风险评估。但是，需要收集有关对自然环境影响评估的进一步信息。特别是硝化细菌在土壤中将铵盐转化为硝酸盐方面发挥了作用。然而，尽管有几种杀真菌剂和除草剂对硝化细菌有抑制作用，但有关杀虫剂对硝化作用的研究还很有限。因此，我们研究了农药施用于土壤时对硝化作用的影响。两种农药的使用均能促进氨氧化，并在高浓度的地替呋喃处理中抑制亚硝酸盐的氧化。此外，Metyhlotenera spp。）主导了农药的应用。