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To determine the optimum exposed length of M.9 for apple genetic resource, the Seohong, Summer Dream and Hongguem grafted on M.9 rootstock were planted in such a way that the exposed length of the rootstock to be 10, 20 and 30 cm.The result showed that as increasing exposure length, TCSA was decreased between 3rd and 6th year after planting in of Seohong, Summer Dream, and Hongguem.