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is located in a section of birch between the spike and the base. Used for two or multiple grafting, its seedlings are called intermediate fruit seedlings. The seedlings are composed of three parts: the seed spike, the middle pickaxe, and the base. Because of the difficulty of breeding dwarfing, low reproduction coefficient and poor root development, the birch branches with certain characteristics will be used as intermediate birch, the use of the base root system developed, solid ground, resistance, adaptability, easy to breed and dwarf birch butt spike, the impact of the joint effect on the spike species, in order to achieve the dwarf tree crown.The conventional cultivation process of seedlings is to choose the local suitable apple real birch as the base, graft the dwarfed birch near the ground, and then graft the apple variety at 25-35cm in the dwarfed middle branch the following year,
ceding
to produce the seedlings. The method of di-branching or segmented buds was adopted to cultivate dwarfed middle apple seedlings, and the seedling period was shortened by 1 year, but the operation technology was more complex. The length of the middle crucle is positively related to the dwarfing and early fruit effect within a certain range, so its length should not be shorter than 25cm.
