How to fertilize pollution-free vegetables

The principle of fertilization for the production of pollution-free vegetables is: organic fertilizers, supplemented by other fertilizers; mainly multi-component fertilizers, supplemented by single-factor fertilizers; mainly based on fertilizer, supplemented by topdressing. When applying chemical fertilizers, the following principles must be mastered: the use of nitrate nitrogen fertilizer is prohibited. If it is required to be applied, the amount of land per mu should be controlled below 25 kg; the fertilizer must be applied in combination with organic fertilizer, the ratio is 2:1, the last time the fertilizer is applied. The time should be 30 days before the harvest. In addition, the following issues should be noted in fertilization:
1. Human excrement should be fully fermented and decomposed, and rinsed with water after top dressing.
2. Fertilizers should be applied deep and early. Deep application can avoid the volatilization of fertilizer and increase nitrogen utilization rate; early application is beneficial to early plant growth and long-term, prolonging fertilizer efficiency. The ammonium nitrogen should be applied to the soil layer deeper than 6 cm when fertilizing, and the urea should be applied to the soil layer deeper than 10 cm.

3. It should be combined with biological nitrogen fertilizer to increase phosphorus and potassium fertilizer. The application of biological nitrogen fertilizer can effectively solve the soil compaction phenomenon caused by the use of chemical fertilizers. Phosphorus and potassium fertilizers have obvious effects on enhancing the resistance of vegetables.
4. Flexible fertilization according to the type of vegetables and cultivation conditions. Different types of vegetables have great differences in the degree of nitrate accumulation. In general, the content of nitrate in leafy vegetables is higher than that of fruit vegetables. The nitrate content of the same vegetable is also different under different climatic conditions. Nitrate is not easy to accumulate under high temperature and strong light conditions, and nitrate is easily accumulated in low temperature and low light conditions. Therefore, in the process of fertilization, the type of vegetables, cultivation season and climatic conditions should be considered, and reasonable application rates should be mastered to ensure that the nitrate content is controlled within the range specified by pollution-free vegetables.

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