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所谓无公害蔬菜,目前较广泛的含义是指上市蔬菜中所含有害物质残留量低于国家规定的允许含量。蔬菜中的有害物质,主要来源于生产蔬菜中的土壤、灌溉水以及施用农药不当所造成的。前两个因素可以防患于未然,对用于生产上的土壤及灌溉水应事先进行检测,确保未受污染才用于生产蔬菜。农药只要注意使用方法,保证蔬菜中的有害物质残留量低于允许水平是完全办得到的。一是掌握安全使用农药的间隔期。最后一次施用农药至蔬菜收获的天数,称为农药安全施用的间隔期。蔬菜常用杀虫农药中,安全间隔期为2天的有二氯苯醚菊酯:5天的有敌敌畏、辛硫磷、速灭杀丁和马拉硫磷;7天的有乐果、敌百虫和乙酰甲胺磷;15天的有奎硫磷。蔬菜常用杀菌剂中的安全期比杀虫剂长。3天的有
The so-called pollution-free vegetables, the current broader meaning refers to the listed vegetables contained in harmful substances below the national allowable levels. Harmful substances in vegetables, mainly from the production of vegetables in the soil, irrigation water and pesticides caused by improper application. The first two factors can be a precautionary measure. Soil and irrigation water used in production should be tested in advance to ensure that they are used in the production of vegetables without contamination. As long as pesticides pay attention to the use of methods to ensure that vegetables contain less than the allowable level of residues is completely available. First, grasp the safe use of pesticides interval. The number of days from the last pesticide application to vegetable harvest is called the interval between safe pesticide applications. Of vegetables commonly used insecticidal pesticides, the safety interval of 2 days of Permethrin: 5 days of dichlorvos, phoxim, speed kill Ding and malathion; 7 days of dimethoate, the enemy 100 insects and acephate; 15 days with quetiapine. Vegetable fungicides used in the safety period longer than pesticides. 3 days there