毒死蜱、联苯菊酯在模拟房屋白蚁预防施工的野外试验地的残留动态研究

研究了在野外条件下不同施药量和不同处理方法毒死蜱和联苯菊酯在土壤中的降解动态。结果表明，联苯菊酯的持效性比毒死蜱的长。在白蚁防治推荐使用浓度下，两种农药在有覆盖处理组的降解都比在无覆盖处理组的幔。同时。施药量对降解速率有重要的影响。毒死蜱在施药量30g／m^2、20g／m^2有覆盖处理组及30g／m^2无覆盖处理组的半衰期依次为：186．3d、171．3d、60．2d。在施药量为1．875g／m^2、1．25g／m^2有覆盖处理组及1．875g／m^2无覆盖处理组中，联苯菊酯的半衰期依次为：302．6d、203.3d、107．0d。

Study on Residue of Chlorpyrifos and Bifenthrin in Field Soft Simulating Housing Termite Prevention Treatment

The residue of chlorpyrifos and bifenthrin in field soil at different dosage and treatment with or without covering was studied at termitiddal application rates. The results showed that bifenthrin was more stable than chlorpyrifos. The rate of degradation of two termiticides in treatment with covering was slower than without covering and the initial concentration of termiticides in soil had important effect on their degradation rate. The half- life of chlorpyrifos in 30g/m^2 and 20g/m^2 treatment with covering was 186.3 days and 171.3 days, but in 30g/m^2 treatment without covering, it decreased to 60.2 days. As for bifenthrin, in 1. 875g/m^2 and 1.25g/m^2 treatment with covering and 1.875g/m^2 treatment without covering, the half-llfe was 302.6, 203.3, 107.0 days respectively in order.