The pruning method of the year-to-year tree of the trunk sparse layer

Trunk sparse layer tree is higher, generally 5.5 to 6.5 meters, stem height of about 1.5 meters, crown width of 5 to 6 meters. The first to the fourth year is the main period of training. Leave 6 to 7 secondary branches at the top as auxiliary branches every winter, and the rest stick to the secondary branches of the trunk, which are gradually cut off from the bottom up every year to promote the extended growth of the trunk.