苹果密植园冬季修剪的原则是,群体密,个体稀,分枝级次低;因树修剪,随枝造形;有形不死,无形不乱;旺树轻剪,弱树重剪。通过修剪不断调节树势,使树体长势不强不弱,保持中庸。——开张角度。枝条角度加大,树冠扩大,光合作用增强,光合产物自留量增多,外运交换量相 The principle of apple pruning winter pruning in winter is that the population is dense and individual is rare with low branching level; pruning with trees and forming with branches; tangible immortality and invisibility; Through the pruning of constantly adjusting the tree potential, so that the body is not weak growing strong, maintain the golden mean. - opening angle. Shoot angle increased, the crown to expand, photosynthesis increased, increased self-storage of photosynthetic products, the exchange volume