Watermelon is a high-yield economic crop that is warm, cold-resistant and requires more fertilizer. In general, high-nitrogen watermelon, yielding base, adequate fertilizer can promote plant growth and development, promote differentiation, so that early flowering, early sit melon, early maturity, and potassium is more enzymes in plants catalyst It can promote photosynthesis, protein synthesis, sugar increase, and quality of melon. Therefore, in order to obtain high quality and high yield of watermelon, scientific fertilization is the key.

Fertilizer characteristics

According to tests, the production of 1000 kg per watermelon fruit, nitrogen required 2.5 to 3.2 kg 0.8 to 1.2 kg phosphorus, potassium, 2.9 to 3.6 kg, three elements of about the ratio of 3: 1: 3.5-4. Watermelon has experienced germination, seedling , vine, flowering and melon stages throughout its life . The demand for nutrients varies from period to period. Generally, the absorption of nitrogen, phosphorus and potassium in seedling stage only accounts for 0.6% of the total absorption , the vine growing period accounts for 14.6% of the total absorption , and the melon period accounts for 84.8% of the total absorption .

Fertilization technology

Watermelon fertilization should adhere to the principle of “the base fertilizer is sufficient, and the topdressing should be skillful”. ( 1 ) base fertilizer foot. Base fertilizer is the basis for high quality and high yield of watermelon. The production should pay attention to the application of base fertilizer. The specific fertilizer amount can be determined according to the local soil fertility and yield level. Per 667 square meters generally maturity quality organic fertilizer may be applied 3000 to 4000 kg, cake 100 kg, 15 - 20 kg of urea, superphosphate 35 to 50 kg of potassium sulfate 25 to 30 kg, or three elements of fertilizer 50 to 60 kilograms, combined with deep turning and applying. ( 2 ) Topdressing skill. During the whole growth period of watermelon, it is important to apply the seedling fertilizer, manure fertilizer and fruit fertilizer. ① skillfully Miaofei: Usually not applying fertilizer base fertilizer adequate, but not basal foot, per 667 square meters for a nitrogen fertilizer topdressing 5 to 10 kg, 4 to 5 kg or urea, fertilization time Mastered after the seedlings grow 2 true leaves. ② skillfully strong spread fat: fat spread according strong for growing, typically when vines grow to 40 to 50 cm, the combination of water per 667 square meters 15 to recover 20 kg of urea, potassium sulfate 10 to 15 kg, or High-nitrogen compound fertilizer 20 ~ 25 kg to promote the growth of melons. ③ skillfully fruit fertilizer: when the first batch Yougua long hair to fade and the size of eggs per acre dressing (or banding with watering fertilizing, soil after application) 25 to 30 kg of fertilizer to promote fruit enlargement And the accumulation of fruit contents such as sugar.

Precautions

Watermelon should not be applied with chlorinated fertilizer, because watermelon is a chlorine-free crop, and the application of chlorine-containing fertilizer will affect the quality of the melon. Do not apply concentrated fertilizer when it is dry. Seedling avoid too much fertilizer, fertilizer and the root portion can not be too close, beware of root burn seedlings, generally require 10 cm left and right from the main root.