苹果半矮化砧木新品种‘青矮 3 号’

 ‘青矮3号’是1978年从苹果矮化砧木M₉的自然实生苗中选育而成的半矮化砧木新品种。其树冠中等，长势中庸；作中间砧嫁接红富士树，3年生树全部结果，7 ~ 14年生树平均产量42 270 kg · hm^-2（M₂₆嫁接树为34 785 kg · hm^-2），丰产性强；嫁接树的果实着色好，品质优，果形指数、果实硬度和可溶性固形物分别为0.87、7.8 kg · cm^-2、14.3%，与M₂₆嫁接树相当。嫁接红富士的盛果期树，树高3.83 m，冠径3.57 m，为M₂₆嫁接树的130%，属半矮化砧木；干性强，可不设立柱栽培；适宜在山东、河北、山西、陕西等苹果主产区应用。

A New Apple Semi-dwarfing Rootstock Cultivar Qing Ai3

‘Qing Ai 3’is a new apple semi-dwarfing rootstock selected from the M9seedlings in 1978.Not only its crown but also its growth is medium.Grafting on the inter stock,the Fuji tree fully produced at 3 years old.The average yield of the tree of 7–14 years old is 42 270 kg.hm-2,while that on M26 is 34 785 kg.hm-2,which shows it has high-yield character.The fruits have good quality and colour.The soluble solids content of Fuji grating on the inter stock is 14.3%,the hardness is 7.8 kg.cm-2,and the fruit index is 0.87,which is equal to M26.The Fuji tree dwarfing on the inter stock in high-yield year has a 3.83 m height and a 3.57 m crown diameter,which is 30% more than that of M26.Therefore,‘Qing Ai 3’ belongs to a semi-dwafing rootstock.It has straight trunk which can stand without pillars,which is suitable for the application in the main apple production area such as Shandong,Hebei,Shanxi and Shaanxi.