果树品种的良种化,是实现果品商品化的重要条件之一。已经投产的果园,果树品种良莠不齐,只有通过间接更换良种,才能优质高产获得较高的经济效益。1986年3月我们采用留大骨架、多头、长穗高接,高改20年生大苹果树200余株,取得可喜的成果。现将苹果的多头长穗高接方法,简介如下: 一、高接时期:3月上中旬倭锦、祝光、印度苹果已经萌芽或现蕾(气温14℃以上),树体生理活动加快,树液开始流动时进行高接,高接的主要品种为金冠,次为富土。二、留好骨架:20年生的倭锦、祝光、印度苹果,树冠高大(树幅5—6米),高接时一定要合理利用原有骨架。树体分两层安排主枝,上 The improvement of fruit tree varieties is one of the important conditions for commercialization of fruit products. The fruit orchards and fruit trees that have been put into operation have good and bad varieties. Only through indirect replacement of elite varieties can high-quality and high-yielding produce higher economic benefits. In March 1986 we used to stay big skeleton, long, high spike length, high change 20-year-old large apple trees more than 200 strains, made gratifying achievements. Now the apple long long spike high access method, the brief introduction is as follows: First, the high pick up period: In March the upper midwood Kam, wish light, Indian apple has budding or budding (temperature above 14 ℃), tree physiological activity to speed up, Tree liquid began to flow when the high access, the main varieties of high access for the Golden Delicious, times for the rich soil. Second, leave the skeleton: 20 years of Japanese Kam, wish light, Indian apple, tall tree (tree width 5-6 meters), high take reasonable use of the original skeleton. Tree divided into two main branches, on