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It will be sweeter to increase the application of phosphorus and potassium fertilizer
Phosphorus and potassium can promote the formation, transportation and storage of carbohydrates. Therefore, increasing phosphorus and potassium fertilizers can increase the sugar content of watermelons, while the simple application of nitrogen fertilizers will reduce the sugar content. Tests have shown that the watermelon base fertilizer is applied to high-quality farmyard fertilizer 3000-4000 kg per acre. After topdressing phosphorus and potash fertilizers, the sweetening effect is good. Generally after the watermelon is sitting on the melon, applying 10 kg of potassium sulfate per acre can increase the sweetness of the watermelon by 1 to 2 percent; add 2.5 to 3 kg of water to the plant ash to 50 kg of water, stir and soak for 8 to 12 hours, and take the clear liquid sprayed on On the leaf surface, the yield can be increased by more than 10%, and the sugar content can be increased by 0.5 to 1 degree. In the early stages of watermelon growth, 0.2% potassium dihydrogen sulfate solution is sprayed, or 5 kg of phosphorus fertilizer is applied per acre point in the extension period, and the sweetening effect is better.