山丁子、海棠、山梨等砧木苗无性育苗繁殖,就是利用地下根部进行培根繁殖。这种育苗方法,在缺乏种子地方,可节省若干种籽,增加砧木苗株数,并可达到提前嫁按,提前出圃。赤峰市山西营子果树苗圃,1959年试验一亩山丁子的根段育苗繁殖,当年嫁接20％,其余由于被金龟子为害,未行嫁接,1960年根据这一经验,又进行了山丁子、海棠、山梨等地下根段繁殖,共育苗15.49亩,据初步观察,成活能达75％以上,即每亩地可产苗九千至一万株。其培育方法和播种育苗有许多相同处,现仅将修根和栽培经验 Hill Dingzi, Begonia, Yamanashi rootstock seedling breeding asexual seedlings, is the use of underground roots for bacon breeding. This seedling breeding methods, in the absence of seeds, can save a few seeds, increase the number of rootstock seedlings, and can reach early marry press, early nursery. Chifeng City, Shanxi Yingzi fruit tree nursery, 1959 experiment Mu acre seedling root seedling breeding, then grafted 20%, the rest due to being beetle damage, no grafting, 1960 based on this experience, but also for the Hill Dingzi, Begonia , Yamanashi and other underground roots propagation, a total of 15.49 acres of nursery, according to preliminary observations, survived up to 75%, that is, per acre can produce nine thousand to ten thousand strains. Its cultivation methods and planting seedlings have many of the same, now only root repair and cultivation experience