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
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.
This paper presents information on propagation and culm production of Bambusa
vulgaris and B. polymorpha by node cutting method. Five clumps each of B. vulgaris and B.
polymorpha were selected for the study. One culm from each clump of both the species were
collected and segmented into one-node cutting of 30 pieces in three sections (upper, middle and
lower) with sharp saw. Then propagules were developed from node cuttings in the soil bed
nursery during the rainy season (June-July). Node cutting of only middle portion of the culm
produced roots and rhizomes. Sixty six percent node cutting of B. vulgaris and sixty percent of B.
polymorpha of the middle portion produced roots. After having rooted and rhizomed successfully,
10 healthy propagules were planted at a spacing of 3.5 m x 3.5 m in the field for their growth
performance. Node cuttings of B. vulgaris produced 4.28 culms and those of B. polymorpha
produced 2.12 culms per clump per year. There is significant difference of culm production at 5%
level (t = 3.5678). After five years of the planting, the bamboo attained merchantable size and was
harvested from the clumps of both the species. This method with no temperature and moisture
control facilities and propagation structure was found suitable for the farmer.
Naturally crossed hybrids ofAcacia mangium x Acacia auriculiformis are found in the A.
auriculiformis and A. mangium plantations of Bangladesh. During 1995 superior hybrid Acacia
trees were selected and propagated by using shoot cuttings for establishing a hedge orchard.
Coppice shoots sprouted from this hedge orchard plants were used as stem cuttings for rooting
trials, and successful cuttings from different clones provided planting materials for clonal trial
experiments. There were highly significant differences between cuttings taken from different
zones of the shoot (cutting types) and hormone treatments in the number of successful cuttings
and number of roots produced per rooted cuttings. Tip cuttings (2 noded) rooted 71.5% and
produced 3.7 roots per rooted cutting when treated with 500 ppm IBA. Similarly, 3rd node cutting
also rooted 80.0% and produced 4.1 roots per rooted cutting under the same treatment. A slight
decrease in rooting success (55.5%) and number of roots (3.2) per rooted cutting were recorded in
4th node cuttings under the same treatment. But percentage of rooting success and number of
roots per rooted cuttings were not increased in the above mentioned three types of cuttings when
treated with higher concentration (1000 ppm or 1500 ppm) of IBA. When a higher concentration
of IBA (1000 ppm) was used in treating 5th node cutting better (50.0%) rooting success and
number of roots (3.3) per rooted cutting were observed. In respect to rooting success and number
of roots produced per rooted cutting the variation between the cuttings of different zone of the
shoot (cutting type) and hormone treatment was highly significant. There were significant
differences between clones in height growth. The highest and lowest height growth were recorded
in clone 2 (87.21cm) and in clone 13 (38.5cm) respectively.
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