Foliar fertilization technique for vegetables

The aqueous solution of nutrients needed by plants is sprayed on the leaves to make the plants absorb effective nutrients directly through the leaves, which is called vegetable foliar fertilization technology. Compared with soil fertilization, this technique has the advantages of faster transformation, high fertilizer use efficiency and promoting the absorption of nutrients by roots. Foliar fertilizer can be divided into a large number of element fertilizers, micro-fertilizers, organic fertilizers, microbial fertilizers, or foliar fertilizers of photosynthesis promoters or pesticides, and so on. Urea, potassium sulfate, calcium superphosphate, ammonium nitrate and micro-fertilizer are commonly used in production. And so on. Leaf application should pay attention to the following points: 1, on the basis of sufficient base fertilizer and timely topdressing; 2, according to vegetable species, growth stage, growth, fertilization purpose, select appropriate types of foliar fertilizer; 3, the concentration of liquid fertilizer should be reasonable; 4, choose evening or cloudy day spraying 5. Pay special attention to evenly spraying the vigorous leaves and the reverse side of the leaves. For example, for cucumber, eggplant, pepper, celery, leek and other vegetables in the greenhouse, the solid multi-element compound foliar fertilizer "Gaole" with low cost and obvious yield-increasing effect with disease prevention and treatment drugs can be selected. The sugar and nitrogen solution of 0.2% urea, 0.2% potassium dihydrogen phosphate and 1% sucrose could not only increase yield and disease resistance, but also reduce the harm of downy mildew; light and micro-fertilizer and light absorption inhibitors were applied to cucumber, cucumber, pepper, cloud bean, celery, cabbage, cabbage, lettuce, cauliflower and so on.