毛白杨催根处理时,一般是直立放置(芽尖朝上),为提高温度,坑底要铺设马粪。在我们实际工作中,发现用上法有一个矛盾:开春地温升高时,随着插穗基端愈合组织形成,芽相应膨大萌发,4月中旬,催根尚未完成时,顶芽萌发已达2-3寸,有的展叶生长,不得不提前扦插。其结果是:①给扦插作业带来困难,极易伤芽;②芽的 Populus root urgency treatment, the general is to place upright (bud tip upward), in order to raise the temperature, pit laying horse manure. In our practical work, we found that there is a contradiction in using the method. When the spring temperature is high, the shoots expand and germinate with the healing of the basal end of the cuttings. In the middle of April, 2-3-inch, some Zhanye growth, had cuttings in advance. The result is: ① to the cutting operation is difficult, very easy to injury Bud; ② bud