The correct fertilization process for watermelon

1. Fertilize seedlings. In the northern region, apply 1.5-2.5kg of urea per 667m2 at the stage of 4-5 true leaves. In the southern area, before spreading the vines, water the human excrement and urine 2 or 3 times, and apply 20-30kg of human excrement and urine per 667m2 each time.

2. Extend manure. In the northern area, apply 5-10kg of urea and 3-5kg of potassium sulfate per 667m2 in the early stage of spreading; in the south, apply 50-70kg of cake fertilizer or 500-750kg of decomposed poultry manure per 667m2 after spreading.

3, fruit set fertilizer. Apply when young fruit eggs are the size of eggs. In the northern region, apply 10-15kg of urea and 5-6kg of potassium sulfate per 667m2; in the southern region, add 0.7-1kg of urea or compound fertilizer to human excrement and urine for every 667m2.

4, puffed melon fertilizer. When the size of the fruit bowl, apply 7-10kg of urea and 5-6kg of potassium sulfate per 667m2. Stop top dressing 1 week before harvest. In the later stage of the results, the mixed solution of 0.3%-0.4% potassium dihydrogen phosphate and 0.2%-0.3% urea can be used for top dressing outside the roots, generally spraying once every 5-7 days, 2 or 3 times in a row.