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2. Expanded melon fertilizer: After the watermelon sits on the melon, it enters the period of expanding the melon. At this time, it is the period of the largest amount of fertilizer in the whole life of the watermelon. In this period, the topdressing can promote the rapid expansion of the fruit, which is called the expanded melon. Generally, it is applied twice, with phosphorus and potassium fertilizers as the mainstay, combined with nitrogen fertilizer. When the first top dressing is in the size of the young melon egg, the compound fertilizer is 20-25 kg, the urea is 5-6 kg, or the diammonium phosphate is 15-20 kg, and the potassium sulfate is 15 kg; the second time in the size of the melon bowl, 5 to 7.5 kg of diammonium phosphate and 2 to 3 kg of potassium sulfate. As a result, the melons have been sealed, and it is easy to damage the stems and leaves by ditching or opening a hole. Fertilization should be carried out immediately after water application or spraying.
1. Promote vine fertilizer: After the watermelon is vine, the top dressing between the plants can promote the rapid elongation of the vine. The growth of watermelon stems and leaves and the formation of flowers not only require a large amount of nitrogen fertilizer, but also phosphorus and potassium fertilizers. Therefore, this topdressing should be based on nutrient-complete organic fertilizer, plus an appropriate amount of quick-acting fertilizer. The method of topdressing is: open field cultivation, after planting the faucet, open a topdressing ditch with a depth of 10 cm and a length of 40-50 cm in the middle of the two melon seedlings, and apply 35-40 kg of fermented cake fertilizer per acre. Diammonium phosphate granule fertilizer 10~15 kg, buried with soil after application; mulching cultivation, can be applied when the vine grows to 20-30 cm, in order not to damage the mulch, the film can be lifted up when topdressing At a distance of 20 cm from the base of the plant, a groove of 10 cm wide and 10 cm deep is opened. After the application, the ditch is stepped on, and the mulch is covered. The type and amount of fertilization are cultivated in the open field.
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