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随着农业生产集约化的发展,无机化肥(特别是氮化肥)的施用不断增多。化肥的施用,在很大程度上促进了蔬菜和饲料作物的发展。化肥不仅提高了作物的产量、改善了品质,也增加了产品中的无机物、蛋白质和维生素等。不过,从人类营养的观点出发,产品品质不但要看有益物质的含量,还应注意有害成分的含量,硝酸盐即为一例。硝酸盐在生物体内积累,会转变成有毒的亚硝酸盐。亚硝酸盐进入血液,会把血红素转变成高铁血红蛋白,引起机体中毒。研究指出,人体每公斤体重每天最多允许吸收硝酸盐量为4.2毫克。因此,必须严格控制蔬菜
With the intensive development of agricultural production, the application of inorganic fertilizers (especially nitrogenous fertilizers) is constantly increasing. The use of fertilizers has greatly contributed to the development of vegetables and fodder crops. Fertilizers not only improve the crop yield, improve the quality, but also increase the products of inorganic substances, vitamins and so on. However, from the point of view of human nutrition, product quality not only depends on the content of useful substances, but also pay attention to the content of harmful ingredients, nitrate is an example. Nitrates accumulate in the living body, turning them into toxic nitrites. Nitrite into the blood, heme will be converted to methemoglobin, causing poisoning. The study pointed out that the body per kilogram of body weight per day, the maximum allowable absorption of nitrate was 4.2 mg. Therefore, vegetables must be strictly controlled