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无公害蔬菜生产的施肥原则：以有机肥为主,辅以其他肥料；以多元复合肥为主,单元素肥料为辅；以施基肥为主,追肥为辅。尽量限制化肥的施用,如确实需要,可以有限度、有选择地施用部分化肥。化肥的施用应注意掌握以下原则：禁止使用硝态氮肥。控制用量,一般每亩不超过25公斤。化肥必须与有机肥配合施用,有机氮与无机氮比例为2：1。少用叶面喷肥,虽然叶面喷肥
Fertilization principle of pollution-free vegetables: mainly organic fertilizer, supplemented by other fertilizers; based on multiple compound fertilizer, supplemented by elemental fertilizer; mainly to base fertilizer, dressing supplemented. Try to limit the application of fertilizers, if necessary, can be limited, selective application of some fertilizers. The application of fertilizer should pay attention to the following principles: Do not use nitrate nitrogen fertilizer. Control the amount, generally no more than 25 kg per mu. Fertilizer must be combined with organic fertilizer, organic nitrogen and inorganic nitrogen ratio of 2: 1. Use foliar spray less, although foliar spray