介绍两个我国自己选育的抗寒性强的苹果矮化砧木目前我国生产上应用的苹果矮化砧木，大多数是６０年代从英国引入的Ｍ系和ＭＭ系。由于这些砧木抗寒能力差、在我国北方的一些地区经常发生冻害，因而限制了苹果矮化栽培的发展。为促进我国北方地区苹果矮化密植集约化栽培的... Introduced two of our own breeding cold hard apple dwarfing stocking apple dwarfing rootstocks currently used in China’s production, mostly imported from the United Kingdom in the 60’s M system and MM system. Due to the cold hardiness of these rootstocks, frost damage often occurs in some areas of northern China, which limits the development of apple dwarfing cultivation. To promote the cultivation of apple dwarf planting intensive cultivation in northern China ...