Principles for fertilization of pollution-free vegetables
Mastering the fertilization principle of pollution-free vegetable production can ensure that the content of nitrates and other harmful substances in vegetables that are highly carcinogenic is not exceeded.
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.
The following problems should be noted in fertilization: 1. Human excrement should be fully fermented and decomposed. After topdressing, rinse with water. 2. Fertilizers should be applied deep and early. Deep application can avoid the volatilization of fertilizer and increase the utilization rate of nitrogen; early application will help the plant to grow early and prolong, and prolong the fertilizer efficiency. When fertilization, ammonium nitrogen is applied to soil below 6 cm, and urea should be applied to soil below 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 fertilizer; phosphorus and potassium fertilizer 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, the degree of nitrate accumulation is very different, generally leafy vegetables are higher than fruit vegetables. The same vegetable has different nitrate content under different climatic conditions. Generally, nitrate accumulation is low under high temperature and strong light, and nitrate is easy to accumulate under low temperature and low light. In the process of fertilization, the type of vegetables, cultivation season and climatic conditions should be considered, and the reasonable amount of chemical fertilizer should be mastered to ensure that the nitrate content is within the prescribed range of pollution-free vegetables.
Huaxian County Agricultural Products Inspection and Testing Center Chang Bili
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