关键词: 苹果, 砧木, 品种

Abstract: ‘Qing Ai 2’is a new apple semi-dwarfing rootstock selected from the M₉ seedlings. Not only its crown but also its growth is medium. The internode is 2.3 cm long .The survival rate grafing on the rootstock（Pingyi Tiancha）is 88.2%，while that on the cultivar is 100%. The growth of the 3-years-old dwarfing interstock is 278 cm，while the nursery rate is 88.2%. Grafting on the interstock，The ratio of the trunk of the rootstock/interstock is 1.18，while that of the cultivar/the interstock is 0.81. The grafting union is not swelling，without air root，which shows it has high grafting affinity. Grafing on the interstock in high yield year，The Fuji tree has a 3.80 m height and a 3.63 m crown diameter. It belongs to a semi-dwarfing rootstock which is similar to M₇. 26.7% of the Fuji grafting on the interstock begin to produce at 2 years old. The average yield of the tree of 7–14 years old is 43 140 kg · hm^-2. The soluble solids content of the Fuji is 14.3%，the hardness is 8.1 kg · cm^-2，and the fruit index is 0.85，which is suitable for the application in the main dwaring apple production area such as Shandong，Shaanxi，Shanxi，Henan and Hebei.

Key words: apple, rootstock, cultivar