From the viewpoint of restoring the native landscape, we could utilize coppicetrees for revegetation of reclaimed land by the transplanting. But, in the case of steep slopes, stem cuttings obtained from coppice seems to be more suitable, if it would be possible, from the standpoint of stability, efficiancy, and economy.
Usually, rooting of large sized or thick stem has been thought difficult except limited species such as willow, poplar and ficus. The experimental research was conducted with
Quercus glauca, Clethra barbinervis, Ilex pedunculosa and
Ilex macropoda, in 1984. Fig. 1 and Table 1 show the design of the experiment.
The results were as follows: Each of the previously listed four species sprouted shoots by early July. However, most of them died because of drought and high temperature in the summer.
Quercus obtained from the lower stem near the base showed a considerable rooting by the treatment with 3-Indolebutyric Acid (IBA) 2000 ppm solution, regardless of the stem girth. The rooting ratio was about 80% including the ringing ones, and the longest root was 66.0cm. Although the rooting occurred just in the lower stems even without IBA treatment and also in the central stems just by treatment with IBA 2000 ppm solution, the rooting ratio was reduced remarkablly. There was no effect in the ringing and the treatment with IBA 20 ppm solution. The coating with wax (paraffin) brought rather harmful results for sprouting and rooting.
On the other hand,
Clethra and
I. pedunculosa showed a little rooting in several samples, and
I. macropoda had none at all. However, since the above three species showed a considerable callus tissue, their rooting may be expected by good irrigation in summer.
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