The reason for the poor sweetness of melon is largely related to the improper management of fertilizer and water. When the nitrogen fertilizer is insufficient, the leaves lack luster, the carbohydrates are made less, the sugar is less synthetically converted; when the phosphate fertilizer is insufficient, the growth is slow, the fruit is less fruit; when the potassium fertilizer is insufficient, the leaf margin is prone to yellowing, the leaves are dead, and the metabolism of the cells is weakened. The accumulation of nutrients is small; the lack of calcium, iron, copper and other elements will also affect the accumulation and transformation of nutrients.
In the application of base fertilizer, organic fertilizer should be mainly used, and various inorganic fertilizers should be applied according to the formula. For melons with a yield of more than 2000 kg per mu, 14 kg of pure nitrogen, 14 kg of phosphorus pentoxide and 15.5 kg of potassium oxide should be applied per mu. In the specific operation, 4,000 kg of farmyard manure should be applied per mu of base fertilizer, or 200-300 kg of plant-based commercial organic fertilizer or 100-150 kg of cake fertilizer, and 5-8 kg of urea and 15~18 of diammonium phosphate. Kilograms, potassium sulfate 8~10 kg.
The topdressing seedlings should be applied 2~3 times, and the per-mu period should be 8~10 kg of urea and 4~5 kg of potassium sulfate. In the initial stage of fruit expansion, 10 to 15 kg of urea per acre and 6 to 8 kg of potassium sulfate. In the midst of fruit expansion, the melon seedlings with insufficient stamina should also be supplemented with 8-10 kg of urea and 3-5 kg ​​of potassium sulfate. In addition, in the late stage of fruit expansion, 0.2% to 0.3% potassium dihydrogen phosphate solution can be sprayed twice.
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