4种农药对土壤微生物氮转化的影响

Effects of Four Pesticides on Nitrogen Transformation Activities of Soil Microorganisms

[目的]测定土壤硝酸盐含量,考察4种农药对土壤微生物氮转化的影响。[方法]不同质量分数的农药加入到土壤中,分别在第0、7、14、28天分析土壤样品中的硝酸盐含量。[结果]4种农药对土壤微生物氮转化影响:在试验初期均为促进;至28 d时,克百威显著抑制,百菌清300 mg a.i./kg处理有显著促进作用;吡虫啉与酚菌酮对土壤微生物氮转化无长期影响。[结论]克百威、百菌清使用时需注意对土壤微生物氮转化的影响;吡虫啉、酚菌酮可正常使用。

[Aims] The impacts of four pesticides on nitrogen transformation activities of sod microorganisms were researched by determining the content of nitrate in the soil. [Methods] Different concentrations of pesticides were added into the soil, and the content of nitrate in each soil sample was determined at the 0^th, 7^th, 14^th, 28^th day after treatment. [Results] At the beginning of the test, the four pesticides promoted the growth of activities of microorganisms in soil. At the 28^th day, carbonfuran inhibited the growth of activities of microorganisms, however, 300 nag a.i./kg of ehlorothalonil promoted the growth of activities of microorganisms, while imidacloprid and fenjuntong showed no long-term effect compared with the control group. [Conclusions] Attentions need to be paid to the negative impacts on the microorganisms in soil when carbonfuran and chlorothalonil are applied to soil. Imidacloprid and fenjuntong can be applied when in normal usage.