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Watermelon must be timely fertilizer
1. Precaution vinegar: After the watermelon vine spreads fertilizer between the strains, it can prompt the vines to extend quickly. The growth of stems and leaves of watermelon and the formation of flowers not only require a large amount of nitrogen fertilizer, but also need phosphorus and potassium fertilizers. Therefore, the top dressing should be mainly organic fertilizer with nutrients, plus appropriate amount of available fertilizer. Topdressing methods are: open cultivation, after the plants dump the tap, open a deep, wide, 10 cm wide and 40-50 cm long dressing trenches between the two melon seedlings, apply 35 to 40 kg per mu fermentation of cake fat, Diammonium Phosphate granular fertilizer 10 ~ 15 kg, buried with soil after application is good; mulching film cultivation, can be extended in the melon spread to 20 ~ 30 cm when the topdressing, in order not to destroy the film, fertilizer can be raised on the side of the film , 20 cm from the base of the plant to open a wide, deep 10 cm of the groove, after the application of the seal groove on the solid, and then cover the film, the types and amount of fertilization with open field cultivation. 2. Swelling melon fertilizer: watermelon sits on the melon, that is into the expansion of the melon period, this time is the watermelon in the lifetime needs the largest amount of fertilizer, this period of fertilizer can promote the rapid expansion of the fruit, called swelling melon. Generally two topdressing facilities, mainly phosphorus, potash fertilizer, with the application of nitrogen fertilizer. The first time the fertilizer is applied to the egg size of the young melon, 20-25 kg of compound fertilizer, 5-6 kg of urea, 15-20 kg of diammonium phosphate, 15 kg of potassium sulfate, and the second time in the size of the melon bowl, Mushi DAP 5 ~ 7.5 kg, potassium sulfate 2 ~ 3 kg. The result was that the fruit pods had been ridged and ridged, and it was easy to damage the stems and leaves by furrowing or opening a hole to fertilize. It is advisable to fertilize water immediately after spraying or spreading.