The SX apple dwarf rootstocks were bred from the hybrids between Malus prunifolia Borkh. and M26, M9 or M7 respectively. The experiment was set up in Weibei Area,Shaanxi Province in 1997, with Akita Fuji 1 as scion variety, SX clones and M26(CK)as inter-stocks,M. prunifolia Borkh. as rootstock and most part of inter-stock being buried in soil with 3~5 cm long left out of soil. The results of 7 year investigation showed that the dwarfing ability of SX rootstocks was equal to or higher than M26, with signi...