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‘青矮 2 号’是由 M9自然实生后代中选育而成的苹果半矮化砧木。树冠中等,长势中庸,节间长 2.3 cm。嫁接基砧(平邑甜茶)成活率 88.2%,嫁接品种成活率 100%。3 年生矮化中间砧幼苗生长量 278 cm,出圃率 88.2%。作中间砧嫁接红富士,基砧/中间砧干周比为 1.18,品种/中间砧干周比为 0.81,接口无肿瘤,无气生根,亲和力强;嫁接红富士盛果期树,树高 3.80 m,冠径 3.63 m,矮化性与砧木 M7相近,属半矮化砧木;嫁接红富士树,2 年生树结果株率为 26.7%,7 ～ 14 年生树平均产量 43 140 kg · hm-2;果实可溶性固形物为 14.3%,硬度为 8.1 kg · cm-2,果形指数为 0.85。适宜在山东、陕西、山西、河南、河北等苹果主产区应用。
’Green dwarf 2’ is a semi-dwarfed rootstock of apple dwarfed by naturally occurring progeny of M9. Medium crown, moderate growth, internode length 2.3 cm. Grafting base anvil (Pingyi sweet tea) survival rate of 88.2%, 100% survival rate of grafted varieties. The growth of 3-year-old dwarfing rootstock seedlings was 278 cm and the yield rate was 88.2%. The ratio of root circumference to root anvil / rootstock was 1.18, and the dry-to-circumference ratio of variety / intermediate anvil was 0.81. There was no tumor on the interface, no air rooting and strong affinity. The fruit tree with the height of 3.80 m, with a crown diameter of 3.63 m. The dwarfiness was similar to that of the rootstock M7, which was a semi-dwarf rootstock. The tree yield of two-year-old trees was 26.7% and the average yield of 7-14 year-old trees was 43 140 kg · hm-2 ; Fruit soluble solid content was 14.3%, hardness was 8.1 kg · cm-2, fruit shape index was 0.85. Appropriate in Shandong, Shaanxi, Shanxi, Henan, Hebei and other major apple producing areas.