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随着生活水平的提高,人们对无污染,高品质农产品需求的呼声日高。而现代农业由于过分依赖化肥和农药,致使农产品被污染和品质下降日益严重。由于偏施化肥而导致土壤劣化,微生物单一化,加剧了病虫害的发生,从而使得生产中过多施用农药,造成农产品中农药残留超标。偏施氮化肥还会造成农产品中硝酸盐含量过高。硝酸盐被摄入人体后,还原成亚硝酸盐,被肠道吸收后,导致高铁血红蛋白症,阻碍体内氧的运输,严重时引起生命危险,对新生婴儿危害更大。同时亚硝酸盐进入体内,遇到胺存在极易转化为亚硝胺,是强致癌致畸物质。人体吸收的硝酸盐来自食物,其中来自蔬茶的量占总吸收量的70-80%以
With the improvement of living standards, people are increasingly demanding on the demand for non-polluting and high-quality agricultural products. However, due to over-reliance on fertilizers and pesticides, modern agriculture has caused the pollution and deterioration of agricultural products to worsen. As a result of partial application of chemical fertilizers and lead to soil degradation, microbial homogeneity, exacerbating the occurrence of pests and diseases, making the production of excessive use of pesticides, resulting in pesticide residues in agricultural products exceeded. Partial nitrogen fertilizer can also cause high levels of nitrate in agricultural products. Nitrate is taken into the human body, reduced to nitrite, absorbed by the intestine, resulting in methemoglobinemia, impeding the transport of oxygen in the body, causing serious life-threatening conditions and more damaging to newborn babies. At the same time nitrite into the body, the presence of amine easily transforms into nitrosamines, is a strong carcinogen teratogenic substances. The nitrate that the body absorbs comes from the food, among them the quantity from the vegetable tea occupies 70-80% of the total absorption