BANGLADESH JOURNAL OF FOREST SCIENCE
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
A study was conducted on the preservative treatment of Acacia mangium poles to determine the
treatment schedule for out door use. The poles contained 52.27% sapwood which is generally perishable by
wood destroying organisms. In this study, 27 poles were treated with 10% CCB (Copper-Chrome-Boron)
aqueous solution by Lowry empty-cell process. Three different pressure and three time periods were
applied to evaluate the depth of penetration and amount of retention of the preservative chemicals. It was
observed that preservative chemicals penetrated the entire sapwood portion ofthe poles which is the main
criteria for the protection of poles. But, a little bit increase was observed in penetration with the increasing
pressure and time period. Although, the retention of the preservatives was found to increase significantly
with the increasing pressure and time. The highest retention of22.98 kg/m3 and full penetration ofsapwood
was observed at 1.04 N/mm2 pressure for three hours. It is expected that the applied preservative with the
treating schedule can
condition.
Teak (Tectona grandis Linn, f) is one of the most
well-known versatile timbers in the world. Its
large scale cultivation is much hampered by various
factors. Among them poor germination of
drupes (fruit with seed) is a major constraint. The
causes of poor germination are many such as
emptiness, prolonged and protracted germination,
season and method of seed collection, age of
mother tree and innate problems prevailing in the
seed itself (Dharmalingam 1995). Several informations
exist on method and season of seed collection
of many tree species. But such informations
are scanty in teak. Against this backdrop, a study
was made to find out the influence of collection
methods on germination and seedling attributes
of teak.
Interaction of nine provenances of Acacia mangium Willd. were studied at three
sites of the Philippines such as Lubuagan, Vintar in Ilocos Norte (Region – 1),
Mapuyo, Mobo in Masbate (Region-5) and Lantapan Malaybalay in Bukidnon
(Region-10). The sites were climatically, edaphically and topographically different
from each other. The provenances studied were 13233 (Walsh’s Pyramid, Qld.),
13235 (Mourilyn Bay, Qld.), 13236 (Kurrimine, Qld.), 13238 (Tully Mission Beach,
Qld.), 13240 (Ellerbeck Rd. Cardwell, Qld.), 13241 (Broken Pole Creek, Qld.), 13242
(Abergowrie SF, Qld.), 13460 (Oriomo River, Qld.), 13621 (Piru Ceram, Indonesia).
Analysis of variance for diameter and height showed significant variations due
to provenance, site, and provenance-site interactions. All the provenances except
one (13621) showed the best growth at Bukidnon site due to main effect. The
significant provenance-site interaction was found at Masbate site which was mostly
due to the remarkably different growth behaviour of the provenance 13621.
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