If you want melons to be sweeter, there are six measures to do.

One is to increase the temperature difference between day and night. The larger diurnal temperature difference is beneficial to the accumulation of photosynthates (sugars). In the fruiting period of muskmelon, the diurnal temperature difference should be enlarged as much as possible. Generally, the temperature in the greenhouse is kept at 30 ℃-35 ℃ during the day, 13 ℃-14 ℃ at night, and the temperature difference between day and night is 16 ℃-18 ℃. ?

Second, less application of chemical fertilizer and heavy application of organic fertilizer. Giving priority to organic fertilizer and no or less application of chemical fertilizer is another effective measure to improve the sweetness of muskmelon. General organic fertilizer to chicken dung, bean cake-based, but per mu of rotten chicken manure 15 cubic meters, bean cake 100-150 kg.

The third is to increase the application of potash fertilizer during the melon-bearing period. When the soil nitrogen is high and potassium is low, the sweetness of muskmelon will decrease obviously. Therefore, the amount of nitrogen fertilizer should be reduced and potassium fertilizer should be increased during the melon fruiting period. Potash fertilizer 8-10 kg per mu or high potassium compound fertilizer 20 kg per mu can be applied in the early stage of melon. ?

Fourth, water control before muskmelon ripening. Excessive soil moisture in muskmelon maturity will not only reduce the sweetness of muskmelon, but also prone to "rotten melon". In particular, melons must pay attention to water control within 10 days before ripening. ?

The fifth is to keep enough light. The greenhouse film should be wiped frequently, and the shaded leaves around the melon should be thinned to enhance the light transmittance between the plants. ?

Sixth, timely harvest. In general, melons develop for 30-35 days to fully mature, high sugar content and good flavor. However, at present, some melon farmers often harvest early in order to go on the market early, which seriously reduces the sweetness of melons. Therefore, timely harvest is the most basic measure to ensure the sweetness of muskmelon.