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前言 过去在稀植大冠的栽培制度下,由于整形要求严格,幼树修剪过重,不能适龄结果,并且前期产量很低;完成整形进入结果期后,又因树冠高大,光照恶化,树冠内部逐渐光秃,结果部位外移,难以达到苹果高稳产的目的。随着苹果栽培制度的改革,国内外对密植条件下的树形进行了大量的科学
Preface In the past, under the cultivation system of sparse crown planting, due to strict requirements on plastic surgery, the young tree was over-pruned and could not reach the age-appropriate result and the yield of the previous period was very low. After the plastic surgery entered the fruiting period, due to the tall crown, deteriorating light, Gradually bare, the results of parts of the relocation, it is difficult to achieve the purpose of high and stable production of apples. With the reform of the apple cultivation system, a great deal of science has been done at home and abroad on the tree shape under close planting conditions