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2, chemical fertilizers should be applied deep, early application, deep application can reduce nitrogen volatilization, extend fertilizer supply time, improve nitrogen utilization. Early application is beneficial to early plant growth, prolonging fertilizer efficiency and reducing nitrate accumulation. Generally, ammonium nitrogen is applied to a soil layer of 6 cm or less, and urea is applied to a soil layer of 10 cm or less.
3. Applying biological nitrogen fertilizer, adding phosphorus and potassium fertilizer, and applying biological nitrogen fertilizer is one of the effective ways to solve the limitation of chemical fertilizer. Phosphorus and potassium fertilizer have obvious effects on increasing vegetable stress resistance.
4, according to the type of vegetables and cultivation conditions flexible fertilization, different types of vegetables, the accumulation of nitrates vary greatly, generally leafy vegetables are higher than melons, melons are higher than fruit. In addition, the nitrate content of the same vegetable in different climatic conditions is also different, generally under high temperature and strong light, nitrate accumulation is less. On the contrary, under low temperature and low light, nitrate is accumulated in a large amount. 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.
1. Manure and manure should be fully fermented and decomposed, and rinsed with water after topdressing.
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