Improve the intensity of photosynthesis selection of low temperature resistant anti-aging film without dropping, keep the film clean, wipe film once every 7 days, remove the dust on the film, enhance the transparency. It is also possible to extend the lighting time by artificial light.
Increase carbon dioxide content After 9 o'clock in the sunny morning, 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%.
Reducing nitrogen supply After the watermelon enlarges, it should reduce the nitrogen supply and increase the amount of potassium fertilizer. In the application of swelled melon fertilizer, 15 to 20 grams of potassium sulfate per plant is added, and the absorption of nitrogen by the plants at the later stage of growth of the watermelon is particularly controlled. If excess nitrogen is absorbed, the quality of the watermelon will be degraded. No longer grow, excess nitrogen accumulation in the melon, but make the watermelon sweetness and flavor deteriorate, during this period side vines increase is the performance of excessive nitrogen.
Increase the temperature difference between day and night. Higher daytime temperatures can increase the intensity of photosynthesis and reduce the greenhouse temperature after sunset. This can reduce the respiratory intensity of plants, reduce the consumption of sugar, and allow more sugar to be stored in the melon, which is beneficial to the accumulation of carbohydrates. 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.
Before the harvest, the control of pouring fruits began to develop to 2 to 3 days before harvest. Environmental conditions and cultivation measures played a decisive role in the quality of watermelons. Therefore, watering should be stopped 5 days before harvest of watermelon, which can relatively improve the sweetness of watermelon.
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