Correct use of vegetable leaf fertilizer

Follow-up application of foliar fertilizer is one of the most commonly used and economically effective fertilization methods in vegetable cultivation. That is, the fertilizer is formulated into an aqueous solution with a certain concentration, and sprayed directly on the crop leaves to make up for the nutrients caused by weak root absorption capacity. Inadequate supply. A large number of applications show that the application of foliar fertilizer has an important role in improving the yield and quality of vegetables and extending the supply period. The selection and configuration of foliar fertilizers based on different crop sciences is the key to improving the application effect.

Leafy vegetables Leafy vegetables are mainly edible stems and leaves, such as Chinese cabbage, leeks, Ganlan, spinach, celery and leek and other vegetables. The foliar fertilizers are mainly urea, ammonium sulfate and other water-soluble available fertilizers. Urea concentration of 2%, ammonium sulfate concentration of 0.3%, spraying 60 kg to 80 kg per 667 square meters, spraying two or three times in the whole growing period is appropriate. Can also be sprayed every 667 square meters of 0.3% to 0.5% rice vinegar solution 50 kg to 60 kg.

Melons, solanaceous vegetables, melons, solanaceous vegetables, such as eggplant, pepper, tomato, summer squash, cucumber, beans, kidney beans, and kidney beans, etc., and leaf fertilizers are mainly composed of NPK fertilizer or multiple compound fertilizers. Such as 0.3% of potassium dihydrogen phosphate, 1% of urea + 2% of superphosphate (leaching solution) + 0.5% of potassium sulfate solution, 0.08% of rare earth fertilizer solution, leaf surface treasure, photosynthetic micro fertilizer, ammonium molybdate, etc. . Usually sprayed two or three times during the whole growth period, spray 40 kg to 50 kg per 667 square meters. Spraying compounded multi-element fertilizers on fruits and vegetables is more effective, such as spraying with sugar-nitrogen (0.2% urea, 0.3% potassium dihydrogen phosphate, 1% sucrose). Spraying compound fertilizers can not only increase the yield, but also significantly increase the disease resistance of the plants and reduce the damage of vegetables such as downy mildew.

Bulbs, root vegetables, dioscorea bulbs, root vegetables such as onion, garlic, radish, carrots, potatoes and taro and other vegetables, foliar fertilizers are generally dominated by phosphate and potash fertilizers, such as 0.3% dihydrogen phosphate Potassium solution, superphosphate, and ash leaching solution. Root vegetables can be sprayed with 0.2% borax solution, which can effectively prevent the occurrence of physiological diseases. Spraying 0.1% zinc sulfate plus 0.2% ammonium molybdate solution on potato significantly affected tuber enlargement and quality.

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