Nitrogen Controlled Phosphorus
Planting watermelons should use less N fertilizer. If there are too many N fertilizers, more protein will be synthesized and more sugar will be consumed. Therefore, more organic fertilizer should be applied and phosphate fertilizer should be added appropriately. 300 kg of compost fertilizer per mu, 500 kg of pig dung, 400 kg of human waste and 80 to 100 kg of cake fertilizer, 30 kg of phosphate fertilizer as base fertilizer, or 30 kg of phosphate fertilizer deep in the roots of melon seedlings at the beginning of the development of young melons. It can increase the sugar content of watermelon by 3~4 degrees.
Spray sweetener
Take 30 grams of borax, 5 grams of stevia, 5 grams of calcium chloride, add 50 kg of water and dissolve. After spraying in the seedling and flowering stages in the sunny afternoon, apply 40 kg water to increase the production 1~2. Into, sweetening 1.5 degrees.
Suitable for sweetening fertilizer
Use Stevia 500 grams, 10 kilogram soya beans, add 25 kilograms of water and boil until the water is dry, then cool down, add 15 kilograms of ammonium phosphate and mix well. When the fruit body is set and fruited, it is applied in the soil layer 13 centimeters deep around the root. Each plant applies 30-50 grams, and water is poured 7 days after application, which can increase the yield of watermelon by 20% and increase the sugar content by 1.5-2.5. Percentage.
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