In recent years, the cultivation area of ​​watermelons in greenhouses has been increasing, but the taste of watermelons in greenhouses has been deteriorating. How to improve the quality of greenhouse watermelon?
Improve photosynthesis intensity. The degree of sweetness of watermelon is mainly determined by the number of sugars such as sucrose, fructose, and glucose. The formation of these sugars is inseparable from photosynthesis. Therefore, the use of low temperature and anti-aging drip-free film is selected to keep the film clean, wipe the film once every 7 days, remove the dust on the film, and enhance the transparency. It is also possible to extend the lighting time by artificial light.
Increase carbon dioxide content. After 9 o'clock on the sunny day, open the ventilation vents. When the temperature is low, the vents should be small. The coke carbon dioxide generator can be used to release carbon dioxide when the coke is fully burned. Concentrated hydrochloric acid is placed in a corrosion-resistant container, and then a small amount of lime is added to produce carbon dioxide through a chemical reaction. Dry ice is directly released in the shed. The period of application of carbon dioxide is mainly in the period of fruitful growth of watermelon, especially during fruit development. The suitable time for application is around 10:00 am and the concentration is 0.1% to 0.5%.
Reduce nitrogen supply. After the watermelon enlarges, the supply of nitrogen should be reduced, and the amount of potassium fertilizer should be appropriately increased. When applying Swelling melon fertilizer, 15-20 grams of potassium sulfate is added to each plant, especially to control the absorption of nitrogen by the plants in the later period of growth of watermelon. If excessive nitrogen is absorbed, the quality of watermelon will be reduced. Since the watermelon no longer grows at this time, the excess nitrogen accumulates in the melon, which in turn deteriorates the sweetness and flavor of the watermelon. During this period, the increase in lateral vines is an indication of excess nitrogen.
Increase the temperature difference between day and night. High temperature during the day can increase the intensity of photosynthesis and reduce the greenhouse temperature after sunset, which can reduce the respiratory intensity of plants, reduce the consumption of sugar, make more sugars stored in the melon, is conducive to the accumulation of sugar substances, improve the sweetness of watermelon . In the late growth period of watermelon, ventilation is strengthened, and the day and night temperature difference in the shed can be artificially increased.
Control watering before harvesting. The fruits began to develop until 2 to 3 days before harvest. Environmental conditions and cultivation measures play a decisive role in the quality of watermelons. Many watermelon-producing areas have the saying “dry and melon is sweetâ€. Before the harvest, there was no rain, and the watermelon was indeed sweet. Before the harvest, it encountered heavy rain, while the watermelon was not sweet. Therefore, watering should be stopped 5 days before harvest of watermelon, which can relatively improve the sweetness of watermelon.
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