First, the principle of fertilization of pollution-free vegetables The principle is based on organic fertilizer, supplemented by other fertilizers; mainly multi-component fertilizer, supplemented by single element fertilizer; mainly based on base fertilizer, top dressing supplement. As far as possible, the application amount of chemical fertilizers should be limited. If it is really necessary to apply chemical fertilizers, there should be limited and selective application. The following principles must be applied to the application of chemical fertilizers: the prohibition of the application of nitrate fertilizers shall be controlled at a rate of 25 kg per mu; the chemical fertilizers must be applied in conjunction with organic fertilizers, and the last topdressing of chemical fertilizers shall be 30 days before harvest. Second, in the fertilization should pay attention to the problem (a) human excrement and toilet fertilizer to fully ferment and decompose, top-dressing after pouring water rinse. (b) Fertilizers should be deepened and applied early. Deep application can reduce nitrogen volatilization, extend fertilizer supply time, and increase nitrogen utilization. 1/2 ammonium nitrogen fertilizer is applied to soil layers below 6 cm, and urea is applied to soil layers below 10 cm. (3) Biological nitrogen fertilizer should be used in combination with increasing phosphorus and potassium fertilizers. (D) Flexible fertilization according to the type of vegetables and cultivation conditions. Different types of vegetables, the degree of nitrate accumulation is very different, the general leaf vegetables than fruit vegetables. Under the different conditions of the same kind of vegetable, the content of nitrate in the soil is also different. Generally, under the high temperature and strong light, the accumulation of nitrate is less, and under the low temperature and weak light, the nitrate is accumulated in a large amount. In the fertilization process, the types of vegetables, cultivation seasons, and climatic conditions should be taken into consideration to grasp a reasonable amount of fertilizer.
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