一、骨干枝的修剪骨干枝修剪都应是中截助势修剪，除必要时如为了平衡树势而抑制主枝长势，限制中央领导干高度等，都选用强头、选留饱满芽。其剪截长度应本着“两看一定”的原则，即看去年剪截长度，看今年生长长度，决定今年剪截长度。骨干枝的修剪必须注意剪口芽的方向，特 First, the backbone of the pruning of the pruning of the main branch should be pruned in the cut off the power of pruning, if necessary, such as the main branch in order to balance the potential balance and inhibit the growth of the central leadership and so on, all use the strong head, the election full bud. The length of its cut should be based on the principle of “two see a certain”, that is, look at cut length last year, look at the length of growth this year, decided to cut length this year. The pruning of the backbone branches must pay attention to the direction of the pricking buds, especially