1. Reapply organic fertilizer
The organic fertilizer shall be applied after fermenting and decomposing by high-temperature composting or biogas fermentation. This can kill germs and eggs, reduce the application of pesticides, and improve the yield and quality of vegetables. Vegetables using biogas fertilizer are the best pollution-free vegetables.
2. Scientific application of nitrogen fertilizer
The application of nitrogen fertilizer as base fertilizer or top dressing at seedling stage is conducive to the early growth of vegetables and reduces the accumulation of nitrate in soil and vegetables.
Deep application of nitrogen fertilizer into the soil layer of 10 ~ 15 cm can reduce the loss of nitrogen, improve the utilization rate of nitrogen fertilizer, and also reduce the accumulation of nitrate by vegetables.
The accumulation of nitrate in vegetables increases with increasing nitrogen fertilizer application. The amount of nitrogen applied per acre should be controlled within 30 kg, of which 70% to 80% should be used for deep application of base fertilizer, and 20% to 30% should be used for deep application of seedling fertilizer.
No or less nitrate nitrogen fertilizer. Ammonium nitrogen fertilizer and ammonium nitrogen fertilizer can be selected, such as ammonium sulfate, ammonium bicarbonate, urea, etc.
3. Fertilization for vegetables
Different kinds of vegetables have different degrees of absorption and accumulation of nitrate. Cabbage and green leafy vegetables are easy to accumulate nitrate, and nitrate nitrogen fertilizer cannot be used; eggplants, fruits, vegetables and root vegetables have less accumulation of nitrate and can be applied appropriately, but should be stopped within 15-30 days before harvest Apply nitrate nitrogen fertilizer.
Leafy vegetables are sprayed with nitrogen fertilizer, which is in direct contact with air, and ammonium nitrogen is easily converted into nitrate nitrogen and absorbed by the leaves. Other types of fertilizers are sprayed from the foliar surface, which can easily pollute the leaves.
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