施肥对蔬菜的污染主要有两个途径:一是通过肥料中所含有的有害物质,如重金属、病原微生物、毒气等直接对蔬菜或土壤的污染;二是通过施入大量氮素肥料造成蔬菜体内硝酸盐的过量积累。为了减少 Fertilization of vegetables, there are two main ways of pollution: First, through the fertilizer contains harmful substances, such as heavy metals, pathogenic microorganisms, gas directly to vegetables or soil pollution; the second is through the application of large amounts of nitrogen fertilizer caused by vegetables The excessive accumulation of nitrate. To reduce