Soil Quality Lab., Agricultural Science Center, Federal University of Piauí, Teresina, PI, Brazil.
University of West São Paulo, UNOESTE, Presidente Prudente, SP, Brazil.
Sci Rep. 2020 May 6;10(1):7694. doi: 10.1038/s41598-020-64648-3.
The use of herbicides is important for controlling weeds in crops. However, they can present impacts on soil properties, such as biological properties. In this study, we evaluated the responses of soil microbial biomass and enzymes activity to the application of the herbicides imazethapyr and flumioxazin and their mixture in an experiment under laboratory conditions, using soils with a different history of use. Soil microbial biomass C (MBC) decreased, while microbial biomass N (MBN) was not affected after the application of the herbicides as compared to the control. Soil respiration, respiratory quotient, and dehydrogenase (DHA) activity increased significantly after the application of the herbicides compared to the control. The hydrolysis of fluorescein diacetate (FDA) was not significantly different between the control and the herbicide treatments. The principal response curve showed the largest initial effects for the flumioxazin, followed by imazethapyr and their mixture. Flumioxazin had a different influence on soil respiration and respiratory quotient than imazethapyr and their mixture. Finally, the effects of herbicides on soil microbial biomass and enzymes are short-term as we observed recovery in the biological parameters over time.
除草剂的使用对于控制作物中的杂草很重要。然而，它们可能会对土壤性质产生影响，例如生物性质。在本研究中，我们评估了在实验室条件下，使用具有不同使用历史的土壤，除草剂咪草烟和氟草烟及其混合物的应用对土壤微生物生物量和酶活性的响应。与对照相比，除草剂处理后土壤微生物生物量碳（MBC）减少，而微生物生物量氮（MBN）不受影响。与对照相比，除草剂处理后土壤呼吸、呼吸商和脱氢酶（DHA）活性显著增加。荧光素二乙酸酯（FDA）的水解在对照和除草剂处理之间没有显著差异。主反应曲线显示氟草烟的初始效应最大，其次是咪草烟及其混合物。与咪草烟及其混合物相比，氟草烟对土壤呼吸和呼吸商有不同的影响。最后，我们观察到随着时间的推移生物参数的恢复，除草剂对土壤微生物生物量和酶的影响是短期的。
