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采用田间试验及高效液相色谱检测方法,研究了广枯灵中甲霜灵在中药材头花蓼及土壤中的残留消解动态.实验结果表明,甲霜灵在头花蓼和土壤上的半衰期分别为6.7~7.3 d和12.6~13.9 d.按最高推荐剂量22.5 g.a.i/hm2和2倍高剂量45 g.a.i/hm2使用2~3次,末次施药距收获间隔14 d,甲霜灵在头花蓼植株和土壤中的最终残留量均低于我国蔬菜上的最大残留量0.5 mg/kg.所以广枯灵中的甲霜灵在贵阳地区头花蓼上按照推荐剂量11.25~22.50 g.a.i/hm2使用2~3次,降解速度较快,不易发生积累作用,使用安全.
Field experiments and high performance liquid chromatography (HPLC) detection methods were used to study the residual digestion dynamics of metalaxyl in Magnolia Biondii, a Chinese medicinal plant, Polygonum capitatum and soil.The results showed that half-life of metalaxyl in Polygonum capitatum and soil Respectively, 6.7 ~ 7.3 d and 12.6 ~ 13.9 d. The highest recommended dose of 22.5 gai / hm2 and 2 times the high dose of 45 gai / hm2 use 2 to 3 times, the last application from the harvest interval 14 d, metalaxyl in the head flower Polygonum total plant residues and soil residues were lower than the maximum residue of vegetables in our country 0.5 mg / kg. Therefore, metalaxyl in the broad-bean spirit in the Guiyang Polygonum under the recommended dose of 11.25 ~ 22.50 gai / hm2 use 2 to 3 times, faster degradation, less prone to accumulation, the use of safety.