Six measures to make melons sweeter must all be fully implemented

First, increase the day-night temperature difference. A larger day-night temperature difference is conducive to the accumulation of photosynthetic products (sugars). During the fruiting period of melons, the day-night temperature difference should be widened as much as possible. Generally, the daytime temperature inside the greenhouse should be maintained at 30°C-35°C, the nighttime temperature at 13°C-14°C, and the day-night temperature difference at 16°C-18°C.?

Second, apply less chemical fertilizer and more organic fertilizer. Basing fertilization mainly on organic fertilizer and applying no or little chemical fertilizer is another effective measure to increase melon sweetness. Generally, organic fertilizer is mainly chicken manure and soybean cake; per mu, apply 15 cubic meters of decomposed chicken manure and 100-150 kg of soybean cake as a base fertilizer.

Third, increase potassium fertilizer during the fruiting period. When soil nitrogen is high and potassium is low, melon sweetness will decrease significantly. Therefore, during the fruiting period of melons, the amount of nitrogen fertilizer should be reduced and potassium fertilizer increased. In the early fruiting stage, apply 8-10 kg of potassium fertilizer per mu with irrigation water each time, or apply 20 kg of high-potassium compound fertilizer.?

Fourth, control water before melons ripen. Excessive soil moisture during the ripening period of melons will not only reduce melon sweetness, but also easily cause "watery rotten melons." Especially within the 10 days before melons are about to ripen, attention must be paid to controlling water.?

Fifth, maintain sufficient light. The greenhouse film should be wiped frequently, and leaves shading the melons should be thinned out to enhance light penetration between plants.?

Sixth, harvest at the proper time. Generally, melons need 30-35 days of development to fully mature, only then is the sugar content high and the flavor good. However, at present some melon growers harvest early in order to get to market sooner, which severely reduces melon sweetness. Therefore, harvesting at the proper time is the most basic measure to ensure melon sweetness.