Forestry and Enironment Symposium 2000, Sri lanka

Sixth Annual Symposium of the Department of Forestry and Environmental Science, Sri Lanka. 15- 16 December 2000, Kandy, Sri Lanka

Wednesday, November 01, 2006


D.C. Kaluthota1 K. K. D. S. Ranaweera1 D. M. S. H. K. Ranasinghe2
Faculty of Applied Sciences University of Sabaragamuwa Department of Forestry and Environmental Science,University of Sri Jayewardenepura

Diplerocarpus zeylanicus, an endemic tree in Sri Lanka offers great potential for bridging the gap between supply and demand of timber in the country. However, at present it has not been widely used as a plantation species. Establishment of plantation by seeds has proved somewhat difficult due to low viability etc. Genetically uniform planting stock can be obtained rapidly through vegetative propagation.

With the above objective in mind an experiment was conducted to propagate stem cuttings of D.zeylanicus using a variety of rooting hormones under both mist and non-mist conditions. In all the instances, cuttings of 15 cm length and 0.3-0.4 mm basal diameter with two and half leaves were used. The hormone concentrations used were, Indole Butyic Acid (IBA) 500 ppm, 1000 ppm and 1500 ppm and the commercial hormone Sector (NAA + fungicide). Control did not have any hormone treatment. The medium used was sand. The experiment was conducted under two conditional environments; under a automatic mist and in a non-mist polypropagator, a low cost alternative which was also designed to maintain a high humidity through water manipulation.

After the experimental period of 10 weeks, there was a marked difference between the mist and non-mist conditions in percentage survival of cuttings. In all the treatments, % survival was higher under mist. In terms of percentage rooting, the cuttings under the non-mist propagator did not show rooting at all although callusing was observed in all the treatments at varying success levels. Among the rooting treatments, the highest percentage rooting (38.10%) was shown in the control without rooting hormones closely followed by other hormone treatments. However, the treatment 1000 ppm of 1BA showed the lowest percentage rooting (11.11%).

From these results, it can be concluded that D. Zeylanicus can be effectively propagated by stem cuttings under mist conditions.


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