前言 1970年前,新西兰的苹果砧木的研究是为标准栽植方式选择乔化的无性系(Woodhead等,1954,1955)。以M9为砧木的矮化苹果密植栽培没有被推广,是因为其投资费用高,进行精细修剪费工。但是,为了适应中度密植果园发展的需要,对选育出的新的半矮化砧木的利用再次引起人们对于更矮化型果树的兴趣,从而对这些砧木进行了对比试验。 Introduction Before 1970, the study of apple rootstocks in New Zealand was to select Qiaohua clones for standard planting (Woodhead et al., 1954, 1955). M9 as rootstock dwarf apple close planting cultivation has not been promoted, because of its high investment costs, the fine trimmer labor. However, in order to meet the needs of the development of moderately-dense orchards, the use of newly bred dwarf rootstocks once again aroused people’s interest in the dwarfed fruit trees, and the comparative tests of these rootstocks were carried out.