【摘要】 通过两年两地的田间试验和气相色谱分析,研究了嘧菌酯在黄瓜和土壤中的残留消解动态及最终残留量。结果表明,嘧菌酯在黄瓜和土壤中的消解半衰期分别为2.8～3.0 d、8.3～12.3 d,属于易降解、低残留的农药。在180～270 g(a.i).hm-2的施药水平下,施药3～4次,每次施药间隔期为7 d,施药后距采收间隔期为1、3、5、7 d,嘧菌酯在黄瓜中的残留量,南宁市为0.039 2～0.213 5 mg.kg-1,上海市为0.017 2～0.182 6 mg.kg-1;嘧菌酯在土壤中的残留量,南宁市为0.203 2～0.945 6 mg.kg-1,上海市为0.205～1.440 1 mg.kg-1。更多还原

【Abstract】 In order to make up a standard for safe use of azoxystrobin on cucumber,a supervised trial experiment was conducted to study the residual dynamics and final residues of azoxystrobin in cucumber and soil,respectively.The results showed that the half-lives of azoxystrobin in cucumber and soil were 2.8～3.0 days,8.3～12.3 days,respectively.Cucumber plant was treated with three and four times and interval of 7 days at the dosage of 180 g(a.i)··hm-2 and 270 g(a.i)··hm-2 during the growing season of cucumber.The residue of azoxystrobin in cucumber was found to be in a range of 0.039 24～0.213 5 mg·kg-1 in Nanning and in other range of 0.017 2～0.182 6 mg·kg-1 in Shanghai,respectively while the residue of azoxystrobin in the tested soils were in a range of 0.203 2～0.945 6 mg·kg-1 in Nanning and in other range of 0.205 0～1.399 7 mg·kg-1 in Shanghai,respectively,after the last application 1,3,5 and 7 days.更多还原