近年来,黑龙江省国营农场系统的林业生产发展速度较快,大面积营造农田防护林时,树种选择多为速生的杨树。苗木来源主要靠扦插繁殖。整个育苗过程中,消灭杂草乃是抚育管理中的一项十分繁重的任务。扦插后如不及时进行除草,则易造成草荒,即 In recent years, the system of state-owned farms in Heilongjiang Province has developed rapidly in forestry production. When large-scale construction of farmland shelterbelts, tree species are mostly poplar. The main source of seedlings by cutting propagation. Eliminating weeds throughout the entire nursery is a very heavy task in tending and managing. Cutting if not promptly carried out weeding, it is easy to cause grass shortage, that is