Problems that should be paid attention to during fertilization
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Fertilizer should be applied deep and early, and deep application can reduce nitrogen volatilization, prolong fertilizer supply time and increase nitrogen utilization rate. Early application is beneficial to early plant growth, prolonging fertilizer efficiency and reducing nitrate accumulation. Generally, ammonium nitrogen is applied to soil below 6 cm, and urea is applied to soil below 10 cm.
It should be combined with biological nitrogen fertilizer to increase phosphorus and potassium fertilizer. The application of biological nitrogen fertilizer can effectively solve the problem of limiting chemical fertilizer. Phosphorus and potassium fertilizer have obvious effects on increasing the resistance of vegetables.
Fertilization should be applied flexibly according to the type of vegetables and cultivation conditions. The accumulation of nitrates varies greatly among different types of vegetables. Generally, leafy vegetables are higher than fruits and vegetables. The same vegetable has different nitrate content under different climatic conditions. Generally, under high temperature and strong light, nitrate accumulation is less. On the contrary, in low temperature and low light, nitrate is accumulated in large amounts. 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.