| Summary: | 碩士 === 國立臺灣大學 === 農業化學研究所 === 101 === The interaction between pesticides affects the persistence of fungicides and insecticides in the environment, and even the use of the interaction of the soil microorganism. In this study, the effect of mix application of two fungicides, carbendazim and thiophanate-methyl, with three insecticides, malathion, carbaryl and fenvalerate on persistent of these pesticides on soil was investigated. Meanwhile,the impact of soil communities was also monitored. From the result, the carbendazim degradation rate is not significantly different between single and mixed treatments in Pu and Wl soil. In Ta soil, the carbemdazim mixed treatment degraded more slowly than single treatment. In addition, the study also investigate the mixed fungicides pesticides in soil degradation on the impact of insecticides in soil degradation. In Pu soil, the carbaryl and fenvalerate degradation rate increased in mixed treatments. In Ta soil, the carbaryl and fenvalerate mixed treatment degraded more slowly than single treatment. In Wl soil, the carbaryl and fenvalerate degradation rate is not significantly different between single and mixed treatments. The thiophanate-methyl metabolite carbendazim was detected. The metabolites produced amount weren’t equal to the thiophanate-methyl degraded amount.The result indicated that thiophanate-methyl may degrade to other metabolites in experimental period.
The DGGE fingerprint and cluster analysis result indicated that pesticide mixed treatment may create the impact on soil community. The impact on bacterial community may inhabit the degradation of pesticides and therefore influence the persistenc of pesticides in environment. Thus there are assessment when appling fungicides with insecticides simultaneously in soils.
|
|---|
