用长接穗嫁接改换苹果品种方法伊犁农业学校宋元治当今世界上果品竞争十分激烈，已不是量的对比，而是质的较量。因此，近年来，一方面新发展的果园大力推广果树新品种，另一方面对现存的劣质果园进行改造即高接换种，改换成国内外市场适销对路的新品种。两年来，我们用长... Grafting with long scion apple varieties method Yili Agricultural School Song Yuanzhi Fruit in the world today is very competitive, is not the amount of contrast, but the quality of the contest. Therefore, in recent years, on the one hand, the newly developed orchards vigorously promote new varieties of fruit trees; on the other hand, the existing poor quality orchards are transformed into high-exchange varieties and replaced with new varieties that are marketable in domestic and overseas markets. Two years, we use long ...