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1 增加施用有机肥有机肥中不但含有蔬菜生长所需的多种营养成分,还能改良土壤,增施有机肥不仅能满足蔬菜对各种养分的需求,还可减少蔬菜污染,提高蔬菜品质。施用有机肥时应注意要充分腐熟,防止有害微生物对蔬菜的污染。常用的有机肥有人畜粪尿肥、绿肥、土杂肥等。 2 减少施用化肥大量使用化肥尤其是氮肥是造成蔬菜植株体内硝酸盐大量积累的主要因素,因此在无公害蔬菜生产中应尽量减少化肥特别是氮肥的施用量,
1 increase the application of organic fertilizer Organic fertilizer not only contains a variety of nutrients required for the growth of vegetables, but also improve the soil, organic fertilizer not only to meet the needs of various nutrients in vegetables, but also reduce vegetable pollution and improve vegetable quality. Organic fertilizer should pay attention to full maturity, to prevent harmful microorganisms in vegetables pollution. Some commonly used organic fertilizer manure urine, green manure, Tuza so. 2 to reduce the use of chemical fertilizers in large quantities Use of fertilizers, especially nitrogen fertilizer is the main factor that causes the accumulation of nitrate in vegetable plants. Therefore, in the production of pollution-free vegetables should minimize the amount of fertilizer, especially nitrogen fertilizer,