^(14)C-甲霜灵在豌豆中的传导与分布以及其在几种作物中残留消解动态

Translocation and Distribution of ^(14)C-Metalaxyl in Pea and Dynamic Degradation of ^(14)C-Metalaxyl Residues in Diffetent Plants

研究了甲霜灵在几种作物上的吸收、传导以及残留消解动态。豌豆根吸收的甲霜灵主要传导到茎与叶中，并在叶缘表现出积累效应，而涂叶法引入的甲霜灵则主要存留于引入叶中，向外传导的很少。白菜和油菜施药3周后残留浓度均低于0．5mg·kg-1。春小麦花期和灌浆期引入的甲霜灵，在收获时主要残留于麦秆中，其残留量可分别占到引入量的42．6％和55．4％，籽粒中的总残留浓度分别为0．35mg·kg-1和0．56mg·kg1，其中一半以上为结合残留。平菇中甲醇提取残留为0．11mg·kg-1，结合残留为0．0147mg·kg-1．一个采收期后，引入量的97％残留于基料中。

Absorption and translocation of metalaxyl by pea and dynamic degradation of its residues in chinese cabbage,rape,spring wheat and Pleurotus ostreatus was studied in this experiments. The results showed that the metalaxyl absorbed by pea's root was mainly translocated to leaves and stems and accumulated in the fringe of leaves, but the metalaxyl which smeared directly on leaves remained mainly at the applied leaves. The residues of metalaxyl in rape and chinese cabbage was lower than 0. 5 mg.kg l after 3 weeks of application. The residues in the spring wheat which was applied in flowering and milklng stage were mainly located in the straw. At the harvest time the residues in straw were 42. 56%and 49. 73% of applied dosage respectively and the residues in the grain were 0. 35 mg.kg-1 and 0. 56 mg .kg-1 respectively. About half of the residues in the grain was bound residues. The methanol extracted residues of metalaxyl in Pleurotus ostreatus were 0.11 mg ·kg-1, bound residues were 0.014 7 mg ·kg-1 and 97 % of applied dosage was remained in substrate.