Answer: The cultivation promoted in the greenhouse, the sooner or later the filming time is directly related to the sooner or later of the grape fruit maturity. According to the characteristics of the local climate, it should not be too early or too late. If the natural dormancy time of the grapes covered by the shed is not reached too early, the cold demand (generally the cold demand of grapes is below 7.2 ℃ and the temperature is 700-1500 hours) is insufficient. Germination rate is reduced. However, covering the shed too late did not show the effect of early cultivation. The period of local canopy is appropriately carried out according to the characteristics of different cultivars. Varieties with short cold demand, such as Venus Seedless, Early Jade, and Purple Jade (requires 700 ~ 1000 hours of cold demand) can be covered in early January. Varieties such as Fujiminori, Xiahei, and Jingya (requires 1,100 to 1,300 hours of cooling) can be covered in the middle and late January, and should be completed by the end of January at the latest.
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