Breeding a new cultivar through the traditional way need a long period, so it doesn't meet the stringent demand of production.
用传统育种方法培育新品种需要的周期过长，无法满足生产上的迫切需要。
It is laborious and slow to create a new cultivar with high-multi resistance and high yield and quality through conventional breeding methods from present germ-plasm.
通过常规育种手段从现有资源中选育出多抗、高抗、优质、高产品种难度大，耗时长。
It is important to replace cleft grafting and cutting grafting with belly grafting as a method of top working to correct chlorosis and improve growth of new cultivar.
用腹接取代劈接和切接作为果树高接更新品种的方法对于克服缺铁失绿症、促进更新品种生长具有重要意义。
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