拉枝是果树整形修剪中常采用的方法,研究者对其作用和机理进行了较多研究。普遍认为拉枝角度与果树的目标树形有关,如我国苹果生产上常用的疏散分层形、纺锤形等树形,主枝角度一般在50~ Drawing branches is often used in fruit tree pruning methods, the researchers conducted more research on its role and mechanism. It is generally believed that the angle of the branch branches is related to the target tree shape of the fruit tree. For example, the commonly used evacuation delamination type and spindle type dendrites in apple production in our country generally have an angle of 50-50 cm.