山西农科院果树所成功地选育出一种新的苹果矮化砧木—S20,最近通过鉴定,这项成果被专家认为居国内领先地位。这种矮化砧木,可使接穗品种早期丰产,品质提高并能大幅度提高栽植密度,该砧木接红星、国光等品种,定植后2—3年即可结果,果实成熟期比普通乔砧提早10—15天,含糖量高,硬度大、耐 Shanxi Academy of Agricultural Sciences Fruit Tree successfully bred a new apple dwarf rootstock-S20, recently passed the appraisal, the results of experts believe that the leading domestic position. This dwarfing rootstock, scion varieties early harvest, improve quality and can greatly improve the planting density, the rootstock then Red Star, Guoguang and other varieties, 2-3 years after planting can be the result, the fruit mature earlier than ordinary Joe ancestors 10-15 days, high sugar content, hardness, resistance