Effects of Cutting Time and Growth Regulators in Root Cutting of Robinia pseudoacacia L., Major Honey Plants
2015
Kim, M.S., National Institute of Forest Science, Suwon, Republic of Korea | Kim, H., National Institute of Forest Science, Suwon, Republic of Korea | Kim, S.H., National Institute of Forest Science, Suwon, Republic of Korea
As a part of the breeding program to preserve and cultivate of Robinia pseudoacacia L. which is the major honey tree of Korea, this study was conducted to demonstrate effects of growth regulators, cutting time and shoot rate on cutting position and growth patterns. In terms of effects of growth regulators, IBA 1,000ppm which is the dipping treated group showed the highest rooting rate, 87%. The soaking treated group such as IBA 100ppm and IBA 500ppm, which had the rooting rate of 85% and IBA 50ppm had the rooting rate of 78%. Also, IBA 2,000ppm had the rooting rate of 65%, by the way the control groups show rooting rate of 45%. This proved effects of growth regulators on the rooting rate. There was, also, a significant difference between treatments with Duncan's multiple range test. Even though the beginning of sprouting delayed to 3~4 weeks after cutting, the earlier cutting time was, the higher the shoot rate after 10 weeks got. The shoot rate of a group cut on March 25 and April 5 were over 85%. On the other hand, the later cutting time was, the more even the shoot developed in each period. In respect of the growth of sapling, the group cut on April 5 were all good in seedling height, ramification, diameter of shoots. As a rooting rate by cuttings position of root cuttings, the middle part of root showed the highest rooting rate, 88%. The upper part's show 83% and the lower part's show rooting rate of 62%
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