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The experiment of picking leaves or promoting defoliation shows that in the middle and late November, removing the fallen leaves of plum trees or spraying 6%~10% urea to promote defoliation can make the dormant buds of Lee germinate earlier and have the function of releasing natural dormancy. However, picking leaves or stimulating leaves will reduce the storage of nutrients and cold resistance of the tree, so it should be used with caution.
The determination of the initial period of thermal insulation determines the initial period of thermal insulation, and the weather data of the local calendar year should be consulted to calculate the cumulative 1000-hour date in the range of 0°C to 7.2°C in autumn and winter, which is the earliest start of thermal insulation. In order to increase the insurance factor, it should be delayed for several days on this basis. Taking Shandong Lunan as an example, the beginning of thermal insulation of plum trees in sunlight greenhouses should be appropriate in late December.
Li Shu sheds its natural dormancy
Low-temperature treatment is currently the most effective way to relieve Li Shu's natural dormancy. In late autumn, when the average daily temperature is lower than 10°C, it is best to hold the shed at 7°C~8°C. At this time, the purpose of the shed is to reduce the temperature, and the order of exposing and covering larvae is the opposite of the normal shed insulation. Open up the vents at night, open the vents, close the vents during the day, and close the vents to keep the temperature inside the booth. After 20 to 30 days of concentrated treatment according to this method, you can smoothly sleep through nature.