The temperature difference between day and night, which has a large temperature difference between day and night, is conducive to the accumulation of photosynthetic products (sugars). In the melon fruiting period, the temperature difference between day and night should be as large as possible. In general, the daytime temperature in the shed is maintained at 30 degrees Celsius to 35 degrees Celsius, the night temperature is maintained at 13 degrees Celsius to 14 degrees Celsius, and the temperature difference between day and night is maintained at 16 degrees Celsius to 18 degrees Celsius.
Less application of chemical fertilizers, reuse of organic fertilizers based on organic fertilizers, and no or less application of chemical fertilizers are another effective measure to improve the sweetness of muskmelon. General organic manure is mainly chicken manure and bean cake, and chicken manure can be used for 15 cubic meters per mu and 100 to 150 kilograms of soybean cake.
As a result, potash fertilizer was added during the growing period, and 8 to 10 kg of potash fertilizer or 20 kg of high-potassium compound fertilizer was flushed with water per acre in the initial stage of the melon.
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