我县自1980年春季,对已长成的苹果实生苗大树进行多头高接换种.采用劈接方法,用塑料薄膜包扎和选用不同类型接穗,改接初步看出: 一、树冠一年全部改接比分次多年改接成活率高21.3,新梢当年生长量长13.3厘米: 二、冠内部成活率比冠外部低9.6,新梢年生长量短20.1厘米; 三、不同类 My county since the spring of 1980, the apple seedlings have grown into long high seedlings. Using split-split method, using plastic film dressing and selection of different types of scion, the initial change to see: First, the crown a year All change the score after many years to change the high survival rate of 21.3, the shoot growth of 13.3 cm year old: Second, the inner survival rate of 9.6 than the crown outside the crown, the shoot growth of 20.1 cm short year; Third, different types