Apply rotten manure, compost, green manure, cake manure, straw, human and animal manure, plant ash, mud manure, organic biological fertilizer, artificial organic fertilizer, etc., supplemented with mineral chemical fertilizer. Vegetable gardens prohibit the use of municipal waste as fertilizer. Raw food such as lettuce and other manure are prohibited from topdressing.
Second, the use of nitrogen fertilizer
Nitrogen is the most used fertilizer for vegetables. Excessive use of various nitrogen-containing fertilizers may cause nitrate accumulation in vegetables.
1. The amount of pure nitrogen in leafy vegetable fields per acre is 20 kg as the critical value. Cabbage, cabbage, mustard and green leafy vegetables should limit the excessive use of nitrogen fertilizer. Among them, pakchoi, rapeseed and spinach varieties should not use nitrogen fertilizer excessively. Such vegetables use no more than 10 kilograms of pure nitrogen per acre. Long-term leafy vegetables should not exceed 15 kg of pure nitrogen per acre.
2. High fertility soil (total nitrogen is greater than 0.12%) does not apply mineral nitrogen fertilizer. In general fertile soil, the ratio of organic nitrogen fertilizer to inorganic nitrogen fertilizer cannot be less than 1: 1.
3. Eight days after the topdressing of nitrogenous fertilizer in vegetables, it is the safe beginning period for harvesting and marketing.
4. Nitrate nitrogen fertilizer in nitrogen fertilizer should be used in combination with ammonia nitrogen fertilizer and ammonium nitrogen fertilizer.
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