毛白杨又名大叶杨,为我国特有的杨树。它生长快,寿命长,用途广,材质好,是深受群众欢迎的优良速生树种。但由于长期以来无性繁殖的结果,使材质出现了红心,趋向退化。为了复壮繁殖毛白杨,我们积极开展了有性繁殖毛白杨的科学试验。一、毛白杨有性繁殖毛白杨在我省栽培历史较长,分布较广,但多为雄株,雌株极少。为了大量复壮繁殖毛白杨实生苗,我圃于六六年夏季在外地采回毛白杨雌株一枝,选一年生加杨作砧木进行了芽接,当年生长发育良好。目前九年生树高六点二米,胸高直径十八厘米。七三年开始开花,今春开花并结了籽。五月三日当蒴果由绿变黄并有部分裂咀时,随即采蒴果放在通风凉爽的室内,经过五天大部分蒴果裂咀时,放在竹帘上用小树条轻轻抽打,种籽落地后除去 Populus alba, also known as Ye Yang, for our unique poplar. It grows fast, long life, wide use, good material, is welcomed by the masses of excellent fast-growing tree species. However, as a result of asexual reproduction for a long time, the material appears red-hearted and tends to degenerate. In order to rejuvenate Populus tomentosa, we actively carry out the sexual reproduction of Populus scientific experiments. First, Populus sexual reproduction Populus tomentosum long history in our province, widely distributed, but mostly male plants, female plants rarely. In order to rejuvenate a large number of Populus tomentosa seedlings, I nursery in the summer of 66 years in the field to recover a poplar female plant, choose an annual plus Yang as rootstock budding, then grow well. Nine-year-old tree height of 6.2 meters, 18 cm in diameter chest height. Seven or three years began to bloom, spring flowering and knotted seeds. On May 3, when the capsule changed from green to yellow and had a partial cleft, the capsule was immediately placed in a cool and ventilated room. After most of the capsule fractures for five days were placed on bamboo curtains and gently stroked with small tree branches. Remove the seeds after landing