蔬菜受污染主要来自两个方面 :一是生产基地生态环境受到污染 ,如土壤、水质、大气遭受“三废”或重金属等污染 ;二是蔬菜生产过程中化学农药、化肥的大量施用、残留与转化。此外一些蔬菜本身对某些污染也有富集作用 ,增加了它的污染性。因此 ,生产优质无公害蔬菜应注意以下八 Vegetable pollution comes mainly from two aspects: First, the ecological environment of the production base contaminated, such as soil, water quality, the atmosphere suffered “three wastes” or heavy metals and other pollution; second is the production of chemical pesticides in vegetables, large-scale application of fertilizers, residues and transformation . In addition, some vegetables also enrich some of the pollution itself, increasing its pollution. Therefore, the production of high-quality pollution-free vegetables should pay attention to the following eight