当前,在蔬菜生产上,盲目地、不科学地过量施用氮肥,不但使蔬菜生长受到影响,而且对人体也会产生危害。特别是叶类蔬菜,容易旺长,叶色浓绿,组织软弱,抗逆力弱,易遭病虫为害和倒伏,延迟成熟期。氮素过多而磷钾不足,还会使大部分糖分用于蛋白质合成,降低蔬菜品质且 At present, in the vegetable production, blindly and scientifically excessive application of nitrogenous fertilizer not only affects the growth of vegetables, but also causes harm to the human body. In particular leafy vegetables, easy to grow long, dark green leaves, weak tissue, weak resistance, susceptible to pest damage and lodging, delayed maturity. Too much nitrogen and inadequate phosphorus and potassium, but also make most of the sugar for protein synthesis, reduce vegetable quality and