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
Survival percentage and height growth of four types of planting propagules (stumps, poly
bag seedling, stumps in poly bag and direct seed sowing) of Gmelina arborea were studied at
Charaljani. Charkai, Keochia and Lawachara Silvicultural Research Stations located al different
regions of Bangladesh. There was no significant differences in the average survival percentage
among the polybag raised seedlings, stump planting, stumps in polybag and seeds directly sown in
the fields. The average survival percentage was 45% to 91% at four sites at the age of 2 years 4
months at Charaljani, Keochia, Lawachara and 1 year at Charkai Silviculture Research Station.
The difference in total height growth of four types of planting propagules was found statistically
significant. The highest height growth (263cm) was obtained in polybag raised seedling at
Charaljani followed by 105 cm at Keochia, 88 cm at Lawachara at the age of 2 years 4 months and
139 cm at Charkai at the age of 1 year after out planting. However, there was no differences in
height growth between the polybag seedlings and stumps in polybag at Lawachara Silviculture
Research Station.
This paper describes the selection of yemane (Gmelina arborea) plus trees. Using point
grading method, 24 plus trees (PTs) of yemane were selected at Talacogon, Mindanao, Philippines
to collect quality seeds and also to use these PTs as the base for future breeding and tree
improvement programmes. Average height of the selected plus trees was 25.50 m and the average
height of the comparison trees was 22.75 m. Selection differential for height was 2.75 m (12%).
Average diameter of the selected plus trees was 28.50 cm and the average diameter of the
comparison trees was 25.25 cm. Selection differential for the diameter was 3.25 cm (13%).
Average selection intensity was 1 tree out of 2,284 trees (approx. 1 tree in 4 ha).This is
comparatively a high selection intensity. It is recommended that for any future breeding
programme with Gmelina arborea, at least 50 plus trees should be included and the selection
intensity may be as low as one tree out of 10,000 trees.
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