Under the condition of protected land, the factors such as poor illumination, high humidity, and high yield often lead to the decrease of cherry sugar content, lighter flavor, and poor coloration. However, long growth period, large temperature difference between day and night, and high management level are favorable conditions for improving cherry quality. . If you are able to avoid weaknesses, you can produce an off-season cherry that is superior to open-air cultivation. The management measures to promote coloration and improve fruit quality are as follows:
First, increase the temperature difference. Fruit coloring to maturity, during the day the temperature is appropriately higher, the night temperature is appropriately lower, and the temperature difference between day and night maintained at 10° C. to 12° C. can promote sugar accumulation, which is beneficial to the improvement of fruit coloring and soluble solid content.
Second, improve lighting. Remove some shading and dense shoots inside the crown. Canopy reflective film under the crown to increase the scattering of light within the crown. During the fruit coloring period, remove the leaves that cover the sun's sunshine, and take care not to remove too much. After the frost period, let off the wind for 2 to 3 days. Roll up the shed film to increase the light, and if the temperature drops or falls on the rainy day, the film will be renewed. Cover it, increase the temperature and prevent rain.
Third, reduce the humidity. After the hard nuclear stage, ventilation and dehumidification, submerged furrow irrigation and hole irrigation, appropriate measures to increase the temperature of the greenhouse, and the relative humidity of the air can be reduced, the transpiration rate of the fruit can be increased, the transportation of sugar to the fruit can be promoted, and the sugar content of the fruit can be increased.
Fourth, water management. Always maintain soil moisture at 60% to 80% of the maximum water holding capacity in the field. Especially when the fruit is inflated and matured, it is necessary to pour water in a small amount to prevent it from drying out and damp, which can effectively prevent cracking of the cherry before harvesting.
Fifth, the root spray fertilizer. After 2 weeks of cherry blossom, after the formation of the leaf curtain, spraying 0.2% urea plus 0.2% potassium dihydrogen phosphate once every 10 to 15 days can supplement the mineral elements required for fruit development, especially the potassium elements related to fruit quality. , It helps to increase the fruit and increase the sugar content of the fruit.
6. Open the shed film. For some late-maturing cherry varieties, when the temperature is higher before harvesting, the shed film is opened or removed, and the fruit is subjected to direct light for 3 to 5 days, which can significantly speed up fruit coloring.
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