苹果幼树纺缍形树体整形的几项结构因子的研究

对影响苹果幼树纺缍形整形的几项结构因子的研究表明，主枝的开张角度及其２级枝的生长状况影响主枝的生长；同时，主枝的数量及其长势影响中心干的生长。在纺缍形树体整形中，应保证适宜的主枝数量，以促进整体生长，同时严格控制主枝的开张角度及其２级枝的生长，以维持树势平衡，及时成花结果。

Studies on the Factors Influncing Spindle Shape Training of Young Apple Tree

The factors influncing spindle shape training of youngapple tree,have been investigated. The results are thaf the growth of main branches was affected by the angle between main branch and trunk and the sub-branch growth vigor. Meanwhile,the number and the growth vigor of the main branch affected the growth of the trunk. In order to enhance young tree's growth and maintain the balance of tree growth vigor,a relativly large angle between main branch and trunk and a suitable growth of sub-branch must be strictly controlled in the spindle shape training.