How to improve the sweetness of watermelon in the shed

To improve the photosynthesis strength, use low-temperature and anti-aging non-drip shed film to keep the shed film clean. Wipe the film once every 7 days to remove the dust on the film and enhance the light transmittance. It is also possible to extend the illumination time by artificially supplementing the light.

Increase the carbon dioxide content after 9 am on a sunny day, open the vents for ventilation. When the temperature is low, the vent should be small. Using a coke carbon dioxide generator, carbon dioxide can be released when the coke is fully burned; put concentrated hydrochloric acid in a corrosion-resistant container, and then put a small amount of lime to produce carbon dioxide through a chemical reaction; directly release dry ice in the shed. The carbon dioxide application period is mainly in the watermelon growth period, especially the fruit development period. The suitable time for application is around 10 o'clock in the morning, with a concentration of 0.1% to 0.5%.

Reducing the nitrogen supply After the watermelon expands, the nitrogen supply should be reduced and the amount of potassium fertilizer should be appropriately increased. When topdressing expanded melon fertilizer, 15-20 grams of potassium sulfate should be added to each plant, especially to control the absorption of nitrogen by plants in the later stage of watermelon growth. At this time, if too much nitrogen is absorbed, the quality of watermelon will be reduced, because at this time No longer grows, excess nitrogen accumulates in the melon, which will worsen the sweetness and flavor of the watermelon. During this period, the increase of side vines is a manifestation of excessive nitrogen.

Increasing the temperature difference between day and night. Higher temperature during the day can increase the intensity of photosynthesis. Lowering the temperature of the shed after sunset can reduce the respiration intensity of the plant, reduce the consumption of sugar, and store more sugar in the melon, which is conducive to the accumulation of sugar. Improve the sweetness of watermelon. Enhancing ventilation at night during the later stage of watermelon growth can artificially increase the temperature difference between day and night in the greenhouse.

Before harvesting, control the watering of the fruit and start to develop until 2 to 3 days before harvesting. Environmental conditions and cultivation measures play a decisive role in the quality of watermelon. Therefore, watering should be stopped 5 days before the watermelon is harvested, so that the sweetness of the watermelon can be relatively improved.

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