Enhance photosynthesis. In order to improve the sweetness of watermelon, the sweetness of watermelon is mainly determined by the amount of sugar, and the formation of this sugar is inseparable from photosynthesis. Therefore, the non-drip film with low temperature and anti-aging is selected to keep the film clean, and the film is wiped once every 7 days to remove the dust on the film and enhance the photosynthesis intensity.
Increase the carbon dioxide content. After 9:00 am on sunny days, open the vents and ventilate. When the temperature is low, the vents should be small. The coke carbon dioxide generator is used to release carbon dioxide when the coke is fully burned; concentrated hydrochloric acid is placed in a corrosion-resistant container, and a small amount of lime is added to generate carbon dioxide by a chemical reaction; dry ice is directly released in the shed. The application period of carbon dioxide is mainly in the period of fertility of watermelon, especially in the fruit development period, and the suitable application time is around 10:00 am, and the concentration is 0.1% to 0.5%. Appropriate nitrogen supply. After the watermelon is inflated, the supply of nitrogen should be reduced, and the amount of potassium fertilizer should be increased appropriately. In the application of the expanded melon fertilizer, each plant is added with 15 to 20 grams of potassium sulfate. In particular, the nitrogen uptake of the plants in the late growth stage of the watermelon is controlled, and before the flowering, the young fruit stage and the expansion stage, each of the squash is applied. Enhance guadi, increase nutrient delivery, and promote watermelon development.
Improve the temperature difference between day and night. During the day, the temperature in the shed should be enhanced to enhance photosynthesis. Sunset reduces the temperature of the greenhouse, reduces the respiration rate of the plants, reduces the consumption of sugar, and allows more sugar to be stored in the melon, which is conducive to the accumulation of sugar and improve the sweetness of the watermelon. Regular spraying of foliar fertilizer promotes the conversion of watermelon from reproductive nutrition to reproductive nutrition and increases sugar content. [i] In the late stage of watermelon growth, the ventilation is enhanced in the evening, and the temperature difference between day and night in the shed can be artificially increased. Increase the accumulation of effective substances
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Shikonin is a kind of organic substance, which is insoluble in water, soluble in ethanol, organic solvent and vegetable oil. It is easy to dissolve in alkali water and precipitate when meeting acid. It can be used in the treatment of acute icteric or non icteric hepatitis, chronic hepatitis and verruca plana. It is also effective for cirrhosis (ascites) and verruca vulgaris. It has anti-cancer, anti-inflammatory, antibacterial and other effects. It is used in the treatment of acute and chronic hepatitis and cirrhosis (ascites). The Department of Dermatology and Hepatology is used for the treatment of verruca plana and psoriasis, local application for the treatment of burns and promoting wound healing. Eye drops are effective in the treatment of herpes simplex keratitis.
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