ISHS Acta Horticulturae 429: XIII International Symposium on Horticultural Economics
EFFECTS OF HORMONE-CHARGED HYDROPHILIC POLYMER ON ROOT REGENERATION IN RED OAK AND BLACK GUM TRANSPLANTS |
| Authors: | Fahed A. Al-Mana, David J. Beattie |
| Keywords: | Quercus rubra, Nyssa sylvatica, Naphthaline acetic acid, Indolebuteric acid, Hydrogel, rooting hormone, Root initiation, Tree transplants |
| Abstract:
An experiment was conducted to investigate the effects of hormone-charged hydrophilic polymer incorporated into sand medium on shoot growth and root regeneration of one year old Quercus rubra(red oak) and Nyssa sylvatica (black gum) transplants. Potassium salts of indolebuteric acid (KIBA) and naphthaline acetic acid (KNAA) each at 0, 7.5, and 15 mg/pot, or a mixture of both at (KIBA 7.5 + KNAA 7.5 mg/pot) and (KIBA 15 + KNAA 7.5 mg/pot) were carried in the polymer and used as hormone-charged polymers. KIBA at 1000 mg/liter was also used as impregnated toothpicks or root dip. The results showed that hormone-charged hydrophilic polymer treatments as well as hormone toothpicks were effective in stimulating root regeneration of both red oak and black gum transplants. The combination KIBA 15 + KNAA 7.5 mg/pot (charged polymer) significantly produced greater root growth of both red oak and black gum than polymer-only and control treatments. The rooting percentage of black gum transplants was greatest in KIBA-toothpicks and KIBA + KNAA 15 mg/pot (charged polymer), and the lowest in the polymer-only treatment. Toothpicks impregnated with KIBA at 1000 mg/liter produced the best shoot and root growth, and best quality of new roots of red oak and black gum transplants. Cost evaluation of different hormone treatments is included. The toothpick treatment was the most effective and most economical technique for applying KIBA to stimulate root regeneration of red oak and black gum transplants. | |
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