The sweetness of watermelon is not how much fertilizer or organic fertilizer is used. The key is to achieve reasonable fertilization. Especially after sitting on melon, it is very important whether phosphorus and potassium are available. Phosphate fertilizer can promote the development of watermelon root system, increase sugar content and quality; Potassium fertilizer can improve the plant's disease resistance, and whether the application of potash fertilizer alone or in combination with other fertilizers is beneficial to increase the sugar content of the fruit. According to the research, only a single application of nitrogen fertilizer watermelon sugar content of only 8%, while the nitrogen, phosphorus, potassium with sugar content of 12%. The adoption of fertilization to increase the sweetness of watermelons must be based on the selection of suitable fertilizer varieties, and must also follow the “appropriate base fertilizer application, light application seedling fertilizer application, suitable application of vine fertilizer, reapplied manure fertilizer, and reasonable application of nitrogen, phosphorus, and potassium”. in principle. Basal fertilizer: The root system of watermelon is more developed. Basal fertilizer should be applied to promote the growth of seedlings. The average medium fertility land, Mushi 18% nutrient bio-organic fertilizer 80-120 kg, with 10-15 kg of urea. Miao Fei: In the case of base fat, melon seedling strong, generally can not apply or less Miaofei before sitting melon. Rattan Fertilizer: The melon plant grows long after being out of the vine. General fertilization 1-2 times, each application of urea 2-3 kg watered 200 kg. Fruiting melon: After sitting on the melon, it is urgent to fertilize and needs a large amount of fertilizer. It should be applied in two separate ways. After the melon is stable (about 0.5 kg of melon), it is applied 1 time, and the interval is 7-8 days for the second time. The sub-mu water fertilizer 500-750 kilograms, or black plus white biological fertilizer 10 kilograms open acupuncture, Shi after cover soil. Excerpted from China Agricultural Press>

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