刺槐播种育苗,在一般管理条件下需两年出圃。为提高留床苗的生长量,我圃根据青岛市林业局种苗站的意见,于1984年春对留床苗进行截梢、平茬试验。试验结果是,截梢30%的,平均苗高和根径生长量比对照分别大31.8%和1倍;比平茬的分别大1.39倍18.5倍。现将结果整理如下。 一、材料与方法 Robinia pseudoacacia sowing seedlings, under general management conditions to be out of nursery. In order to improve the growth of bed-leaved seedlings, according to the opinion of Seedling Station of Qingdao Forestry Bureau, we cut-off and stubble the bed seedlings in the spring of 1984. The results showed that the average seedling height and root diameter of 30% shoots were 31.8% and 1 times larger than that of the control, respectively, which were 1.39 and 18.5 times larger than that of the stubble. The results are now organized as follows. First, materials and methods