First, re-apply organic fertilizer
Organic fertilizers must be applied after high temperature stacking or biogas fermentation, which can kill germs and eggs, reduce the application rate of pesticides, and increase the yield and quality of vegetables. Vegetables that use biogas fertilizer are the best pollution-free vegetables. 
Second, scientific application of nitrogen fertilizer
1. Nitrogen fertilizer should be applied early
Nitrogen fertilizer as base fertilizer or top dressing in seedling stage is conducive to the early growth of vegetables, which is conducive to reducing the accumulation of nitrate in soil and vegetables. 
2. Nitrogen fertilizer deep application soil
The deep application of nitrogen fertilizer to the soil layer of 10-15 cm can reduce the loss of nitrogen, increase the utilization rate of nitrogen fertilizer, and reduce the accumulation of nitrate in vegetables. 
3. Control the amount of nitrogen fertilizer
The accumulation of nitrate in vegetables increased with the increase in the amount of nitrogen applied. The amount of nitrogen applied per mu should be controlled within 30 kg, 70-80% of which should be applied as base fertilizer and 20-30% as deep application of seedling fertilizer.
4. No or little application of nitrate nitrogen fertilizer
Ammonium nitrogen fertilizer and ammonium amide nitrogen fertilizer, such as ammonium sulfate, ammonium hydrogencarbonate, urea, etc., may be used. 
Third, due to the fertilization of vegetables
Fertilization due to vegetables
Different types of vegetables absorb different levels of nitrate accumulation. Cabbage and green leafy vegetables tend to accumulate nitrate, and nitrate fertilizer cannot be used. Solanum, fruit and root vegetables have less accumulation of nitrate. Appropriate application, but the application of nitrate nitrogen fertilizer should be stopped within 15-30 days before harvest. 
2. Leafy vegetables are not suitable for foliar fertilization
Leafy leaves are sprayed with nitrogen fertilizer, which is directly in contact with air. Ammonium nitrogen is easily converted into nitrate nitrogen and absorbed by the leaves. Other types of fertilizers are sprayed from the foliage, which is also likely to contaminate the leaves.
Source: China Fertilizer Information, 2011, Issue 20
Organic fertilizers must be applied after high temperature stacking or biogas fermentation, which can kill germs and eggs, reduce the application rate of pesticides, and increase the yield and quality of vegetables. Vegetables that use biogas fertilizer are the best pollution-free vegetables. 
Second, scientific application of nitrogen fertilizer
1. Nitrogen fertilizer should be applied early
Nitrogen fertilizer as base fertilizer or top dressing in seedling stage is conducive to the early growth of vegetables, which is conducive to reducing the accumulation of nitrate in soil and vegetables. 
2. Nitrogen fertilizer deep application soil
The deep application of nitrogen fertilizer to the soil layer of 10-15 cm can reduce the loss of nitrogen, increase the utilization rate of nitrogen fertilizer, and reduce the accumulation of nitrate in vegetables. 
3. Control the amount of nitrogen fertilizer
The accumulation of nitrate in vegetables increased with the increase in the amount of nitrogen applied. The amount of nitrogen applied per mu should be controlled within 30 kg, 70-80% of which should be applied as base fertilizer and 20-30% as deep application of seedling fertilizer.
4. No or little application of nitrate nitrogen fertilizer
Ammonium nitrogen fertilizer and ammonium amide nitrogen fertilizer, such as ammonium sulfate, ammonium hydrogencarbonate, urea, etc., may be used. 
Third, due to the fertilization of vegetables
Fertilization due to vegetables
Different types of vegetables absorb different levels of nitrate accumulation. Cabbage and green leafy vegetables tend to accumulate nitrate, and nitrate fertilizer cannot be used. Solanum, fruit and root vegetables have less accumulation of nitrate. Appropriate application, but the application of nitrate nitrogen fertilizer should be stopped within 15-30 days before harvest. 
2. Leafy vegetables are not suitable for foliar fertilization
Leafy leaves are sprayed with nitrogen fertilizer, which is directly in contact with air. Ammonium nitrogen is easily converted into nitrate nitrogen and absorbed by the leaves. Other types of fertilizers are sprayed from the foliage, which is also likely to contaminate the leaves.
Source: China Fertilizer Information, 2011, Issue 20
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