(1) Lifting seedling fertilizer: After planting, seedlings can be extracted from seedlings. In combination with pouring seedling water, draw a shallow ditch near the root, and apply 8~10kg of urea per plant.
(2) stimulating manure: After the watermelon is spread, the top dressing can promote the growth of stems, expand the assimilation area, and lay the foundation for the flowering results. This time, the topdressing is mainly phosphorus and nitrogen, but it is necessary to control the amount of nitrogen fertilizer, otherwise it will easily cause "running" and affect the fruit setting. Open a small ditch between the two plants. After fertilizing, mix the loam with a melon shovel and shoot it. Each 667m2 is applied with 75~100kg of decomposed cake fertilizer, 50kg of superphosphate and 5~7kg of potassium sulfate. For early-maturing varieties or weak seedlings, topdressing can be carried out in advance to facilitate the growth of vegetative growth.
(3) Expanded melon fertilizer: The expanded melon period is the peak period of fertilizer demand for watermelon, and it is also a key period for topdressing. Require nitrogen, phosphorus and potassium to be complete, and increase the amount of topdressing. In particular, potassium fertilizer should be sufficient to increase the amount of sugar in the west. In the size of watermelon walnut, on the side of the plant, 30~40cm away from the plant, ditching and topdressing can also be applied with water, and 15~20kg of diammonium phosphate and 10~15kg of potassium sulfate per 667m2. It can also be combined with watering to apply 500kg of diluted manure. When the watermelon is sitting about 15d, when the fruit grows to a diameter of 10~15cm, 5~7kg of urea, 3~4kg of superphosphate, 4~5kg of potassium sulphate or NPK compound fertilizer per 667m2 10~15kg, can be used with water, or watered immediately after application.
In the expansion period of watermelon, the demand for phosphorus and potassium is urgent. In addition to soil topdressing, nitrogen, phosphorus and potassium fertilizers can be sprayed on the leaf surface of the expanded melon, and it can also be combined with spraying. In the chemical solution, 0.2% to 0.3% of urea or potassium dihydrogen phosphate (half each) is sprayed once every 10 days.
In addition to the application of a large amount of elemental fertilizer, it should also be applied with trace element fertilizer. Because the boundary between trace element deficiency and poisoning is very narrow, it is necessary to pay attention to the application amount and concentration. Never use it excessively to avoid plant poisoning and endanger human health and pollute the environment.
Huaxian Agricultural University Liu Huimin
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