毛白杨无性繁殖方法很多,但由于种条不易生根,繁殖率低。一根2米多长的种条,如采用埋条法育苗,一年内仅能繁殖1.5—2株苗木,采用插条法育苗,最多也只能繁殖5株。而采用单芽法育苗,一年内可繁殖30株,繁殖率为埋条育苗的15—20倍,为插条育苗的6倍,可以节约大量种条。具体做法如下: 一、试验材料与方法第一步,砂培育苗:于3月3日(旬平均气温8.8℃),在背风向阳排水良好的地方挖深20厘米、宽60厘米、长2米东西走向的坑,坑 Populus tomentosa asexual reproduction of many ways, but not easy to rooting species, reproduction rate is low. A 2 meters long species, such as the use of buried barbed law seedlings, only one year to reproduce 1.5-2 nursery stock, nursery stock cuttings, up to only 5 breeding. The use of single bud nursery, breeding 30 within a year, the breeding rate of 15-20 times the buried nursery for seedlings 6 times the cuttings, you can save a lot of species. The specific practices are as follows: First, the test materials and methods The first step, sand culture seedlings: On March 3 (ten-day average temperature of 8.8 ℃), digging deep in the leeward sunny positive 20 cm, 60 cm wide and 2 meters long The east-west pit, pit