What should be paid attention to in foliar fertilization of crops?

What should be paid attention to in foliar fertilization of crops? Please point out that foliar fertilization has the advantages of faster transformation, higher fertilizer use efficiency and better nutrient absorption by root system than soil fertilization. Foliar fertilizer can be divided into a large number of element fertilizers, micro-fertilizers, organic fertilizers, microbial fertilizers, or foliar fertilizers of photosynthesis enhancers or pesticides, and so on. There are many kinds of urea, potassium sulfate, calcium superphosphate, ammonium nitrate and micro-fertilizer commonly used in production. Foliar fertilization should pay attention to the following points: 1. Should be carried out on the basis of sufficient base fertilizer and timely topdressing; 2. It is necessary to select appropriate varieties of foliar fertilizer according to vegetable varieties, growth stages, growth and fertilization objectives. 3. The concentration of liquid fertilizer should be reasonable; 4. Choose dusk or cloudy day spraying; 5. Pay special attention to evenly spraying luxuriant leaves and the reverse side of leaves. For example, for cucumber, eggplant, pepper, celery, leek and other vegetables in the greenhouse, the solid multi-element compound foliar fertilizer with low price and good quality and obvious yield-increasing effect can be selected to spray 0.2% urea plus 0.2% potassium dihydrogen phosphate plus 1% sucrose in the greenhouse cucumber in the result period. it can not only increase yield and disease resistance, but also reduce the damage of downy mildew. Applying micro-fertilizer and light absorption inhibitor, spraying tomato, cucumber, pepper, cloud bean, celery, cabbage, cabbage, lettuce, cauliflower and so on. Click to get more foliar fertilizer application methods