The application of decomposed manure, compost, green manure, cake manure, straw, human and animal manure, plant ash, mud manure and organic bio-fertilizer, man-made organic fertilizer, etc. are mainly supplemented with mineral chemical fertilizers. Vegetable gardens are prohibited from using municipal waste as fertilizer. Raw food vegetable lettuce and other banned human and animal manure as topdressing.
Second, the use of nitrogen fertilizer
Nitrogen fertilizer is the most used fertilizer in vegetables. Excessive use of various nitrogen fertilizers may cause the accumulation of nitrate in the vegetable.
1. The critical amount of pure nitrogen is 20 kg per acre per leaf vegetable. Cabbage, kale, mustard and green leafy vegetables have to limit the use of nitrogen fertilizers. Among them, vase vegetables, rapeseed and spinach varieties of Chinese cabbage can't use nitrogen fertilizer excessively, and the pure nitrogen content of this kind of vegetable per acre does not exceed 10 kg. Long-term leafy vegetables use no more than 15 kg of pure nitrogen per mu.
2. High fertility soil (over 0.12% of total nitrogen) does not apply mineral nitrogen fertilizer. The fertility of the soil organic nitrogen fertilizer and inorganic nitrogen fertilizer ratio can not be less than 1:1.
3. Eight days after topdressing with nitrogen fertilizer, vegetables are the beginning of safe harvest.
4. The nitrate nitrogen fertilizer in nitrogen fertilizers should be used in combination with ammonia nitrogen fertilizer and acid ammonia nitrogen fertilizer.
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