First, need fertilizer characteristics. According to the test, for every 1,000 kg of watermelon fruit produced, 2.5-3.2 kg of nitrogen, 0.8-1.2 kg of phosphorus, and 2.9-3.6 kg of potassium are required. The ratio of three elements is approximately 3:1:3.5-4. Watermelon has experienced germination, seedling, vine extension, anthesis, and melon period throughout its life. The demand for nutrients in different periods is different. At the seedling stage, the absorption of nitrogen, phosphorus, and potassium accounted for only 0.6% of the total absorption, the extension period was 14.6% of the total absorption, and the melon period accounted for 84.8% of the total absorption.
Second, fertilization technology. Watermelon fertilization should adhere to the principle of "basal fertilizer should be sufficient, and top dressing should be skillful".
1, base fat enough: base fertilizer is a high-quality watermelon, high-yield basis, production should pay attention to the application of base fertilizer, the specific amount of fertilizer can be determined based on the local soil fertility and yield levels. Generally, 3000-4000 kg of high-quality organic fertilizer can be cooked per mu, 100 kg of cake fertilizer, 15-20 kg of urea, 35-50 kg of superphosphate, 25-30 kg of potassium sulfate, or 50-60 kg of three-element compound fertilizer. Combined deep-spotting.
2, chase fat: watermelon throughout the birth period to focus on good Miaofei, vinegar and fruit fertilizer. 1 Qiao Shi Miao Fei: The general application of basal fertilizer may not be sufficient Miaofei, but the lack of basal, per acre to apply high-nitrogen compound fertilizer 5-10 kg, or 4-5 kg ​​of urea, fertilization time in the seedlings grow out After 2 true leaves, it is carried out. 2 clever Shi Zhuang vine manure: Zhuang vine manure should be based on growth, generally when the melon vines grow to 40-50 cm, combined with water per acre topdressing urea 15-20 kg, potassium sulfate 10-15 kg, or high nitrogen 20-25 kilograms of compound fertilizer to promote the growth of melon vines. 3 Qiao Shi Fruit Fertilizer: When the first batch of young larvae grows to egg size and fades hair, apply 25-30 kilograms of compound fertilizer per acre topdressing (combined with a watering hole or a piece of planting, applying a cover soil) to promote fruit enlargement. And the contents of the fruit such as sugar accumulation.
Third, pay attention to matters. Watermelon should not be used to contain chlorinated fertilizers, because watermelon is a chlorine-tolerant crop, and the application of chlorine-containing fertilizers will affect the quality of the melons. Do not apply too much fertilizer when it is dry. Seedlings avoid excessive fertilization, and fertilization site can not be too close to the root, beware of wounded root burning seedlings, generally require about 10 cm from the main root.
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