果树高接换种改良新法张艳芬，杨茂林（山东省果树研究所泰安２７１０００）果树高接换头改接良种，往往因大树改小造成大量的减产，现介绍一种高接换种改良方法，此法可保留原树结果，待改接枝形成产量后再去除原枝，从而减少了因更换良种而造成的暂时产量损失。嫁接方法... A new method for improving the quality of fruit trees Zhang Yanfen, Yang Maolin (Institute of Pomology, Shandong Province, Taian 271000, China) This method can retain the original tree results, to be modified after the formation of grafts to remove the pruning, thereby reducing the temporary yield loss due to the replacement of the elite. Grafting method ...