Zhu Jiusheng, Qiao Xiongwu, Wang Jing, Qin Shu
Shanxi Key Laboratory of Pesticide Science, Institute of Plant Protection, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China.
Ying Yong Sheng Tai Xue Bao. 2006 Mar;17(3):489-92.
Gas chromatograph and bioassay were used to study biodegradation of acetochlor and its influence on the persistence against Echinochloa crusgalli in soil. The results showed that half-life of degradation of acetochlor was significantly shorter in unsterilized soil than that in sterilized soil under the same experimental conditions of concentrations, water content and temperature, when acetochlor was added to the soil with concentrations of 1.25, 2.5 and 5.0 mg x kg(-1) respectively, which demonstrated that microorganisms could evidently degrade acetochlor in soil. The experiment on degradation of three main kinds of microorganism cultivated in liquid culture medium gave same results above. The bioassay' s result showed that the period of acetochlor persistence against Echinochloa crusgalli was shorter in unsterilized soil than that in sterilized soil, which indicated that existence of microorganism could accelerate the degradation of acetochlor and shorten remaining time of the herbicide in soil, consequently reduce its persistence against the weed.
采用气相色谱法和生物测定法研究了乙草胺的生物降解及其对土壤中稗草持效性的影响。结果表明，在相同的浓度、含水量和温度实验条件下，当分别以1.25、2.5和5.0 mg·kg⁻¹的浓度向土壤中添加乙草胺时，未灭菌土壤中乙草胺的降解半衰期明显短于灭菌土壤，这表明微生物能明显降解土壤中的乙草胺。在液体培养基中培养的三种主要微生物的降解实验也得到了上述相同结果。生物测定结果表明，未灭菌土壤中乙草胺对稗草的持效期比灭菌土壤中的短，这表明微生物的存在可加速乙草胺的降解，缩短除草剂在土壤中的残留时间，从而降低其对杂草的持效性。
