Vegetables, Pesticide Residues And Medication Safety Study

In recent years pesticides have been worldwidely applied to crops in order to control pest and pursue high crop yield. Thus the phenomenon of pesticide residue in the environment and farm products is more and more serious, which causes significant environmental contamination and threatens to human health. The research conducted in this thesis mainly focus on the problem mentioned above. It mostly contained safety use of pesticides and the harvest intervals on vegetables under agricultural conditions, and methods for determination of the pesticide residue in vegetable crops. Consequently the safe-use technical guideline for pesticides applied to vegetable production was established, with quality management and compulsory examination taken as a restraint regulation to supervise and urge farmers to use pesticides in recommended rates.(1) Techniques for determination of eight pesticides residue, such as metalaxyl, chlorpyrifos, etc., in seven vegetables such as pakchoi, cabbage, etc., were developed perfactly, including the perfection of trial method, the reduction of detecting time, the economization of test cost, and the improvement in precision and accuracy of experiments.(2) Degradation and disappearing of residues of chlorpyrifos, cypermethrin, fenvalerate,β-cypermethrin in pakchoi, cabbage, cauliflower, cowpea, haricot bean, towel gourd, and of metalaxyl, chlorothalonil, carbendazim, triadimefon in cucumber, was investigated. The harvest intervals of pesticides commonly used on above-mentioned vegetables in Nantong were proposed, as well as the techniques of their usage.(3) Effective and low-cost pesticides with low toxicity and their alternation were recommended for local agriculture after field trials. Also, a integrated technique system was suggested for the safe use of vegetable to control Prodenia litura, Laphygma exigua Hubner, Pieris rapae, Pseudoperonospora cubensis Rostov., and Alternaria brassicae Sacc..(4) Four guidelines for pesticides safety use on non-polluted pakchoi, cauliflower, cowpea and cucumber were drawn up and promoted in the local non-polluted vegetable production. It will be significant for the benefit of economy, society and ecosystem.