廿团农场苹果园开始建立时,因无经验,品种杂乱繁多,既有好的,也有坏的;有外地的,也有当地的;早、晚熟俱备;说不上那个是主栽品种.而引进的全国30多个品种中,有栽培价值的不过十几个,其余都是产量不高、品质低劣、贮藏性不良、适应性较差.由于品种繁杂,生产管理也有困难,因此,必须存优汰劣,有计划地进行改接换种.四年来,接换3,000多株,有些接后已开花结果,我们也从实践中摸索了一些经验. Twenty groups of farms Apple orchards began to build, because of inexperience, breed variety, both good and bad; there are foreign, but also local; early, late-blooded are prepared; can not say that is the main cultivars. More than 30 varieties in the country have cultivated value, but there are more than a dozen of the cultivated value, the rest are low yield, poor quality, poor storage, poor adaptability. Due to the variety of varieties, production management also has difficulties, therefore, must be eliminated In the past four years, more than 3,000 plants have been replaced and some have been blossomed. We have also gained some experience in practice.