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随着生活水平的日益提高,城乡人民迫切需要量足质优的蔬菜供应。但近年来承包到户使蔬菜耕作制度复杂化,加之温暖潮湿的气候条件,导致病虫种类发生多,为害重。为保证菜农收入,不得不施用大量的化学农药。据调查:成都市郊菜地每年亩用药量为3—4公斤,高的达7公斤以上,这样不仅污染环境,破坏菜田生态系,而且严重地污染蔬菜,降低品质,通过食物链影响人民健康。一、污染情况我们于1987—1988年对成都市7个基地菜乡的3大类9种商品菜进行抽检,结果是:有机氯农药(六六六、DDT)的检出率为100％,在韭黄、甘兰、萝卜等8种商品菜上的残留量为0.021—0.065ppm,未超过安全食用标准,说明这类
With the increasing standard of living, people in urban and rural areas urgently need enough high-quality vegetable supplies. However, in recent years, the contractual household has complicated the vegetable farming system. In addition, warm and humid climatic conditions have led to the occurrence of pests and diseases, which are detrimental to pests. In order to ensure the income of vegetable growers, a great deal of chemical pesticides have to be applied. According to the survey, every mu of pesticide used in the suburbs of Chengdu Municipality reaches 3 to 4 kg per mu and over 7 kg in height. This will not only pollute the environment and damage the vegetable ecosystem, but also cause serious pollution to vegetables, reduce quality and affect people’s health through the food chain. First, the pollution situation We conducted in 1987-1988 sampling of seven major categories of vegetables in seven cities in Chengdu City, nine kinds of food products, the result is: organochlorine pesticides (BHC, DDT) detection rate was 100% In the chives, cabbage, radish and other 8 kinds of food vegetables on the residual amount of 0.021-0.065ppm, did not exceed the safe consumption standards, indicating that such