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 investigated to assess the preliminary growth performance of sal (Shorea robusta) in
mixture with its four associates e.g. chakua koroi (Albizia chinensis), motor koroi (Albizia
lucidor), shimul (Bombax ceiba), udal (Sterculia villosa) and other three site suitable species e.g.
neem (Azadirachta indica), teligaijan (Dipterocarpus turbinatus), dhakijam (Syzygium firmum) in
degraded sal forest in the northern region of Bangladesh. Two experiments were established in
June 2017 and June 2018 at Charkai Silviculture Research Station, Birampur, Dinajpur. Sal and
motor koroi, chakua koroi, neem and teli gaijan were planted in four treatments with four
replications in 2017. In 2018 sal and shimul, udal, dhakijam were planted in three treatments with
four replications. Randomized complete block design was followed. Plantation was established in
June-July. Each replication plot was 14 m x 14 m in size with 49 seedlings for mono-plantation
and 49 seedlings for mixed plantation in 483 ratio at 2 m x 2 m spacing. Single line alternate was
applied in mixed plot for raising plantation. In the experiment, preliminary data on the survival
rate, height (cm) and diameter (mm) of two-years-old and one-year-old seedlings of sal and
associate species from single and mixed plantation data were collected in July, 2019. Analysis of
data showed significant differences among sal and selected treatment species at 5% significant
level other than neem. These findings revealed that, as site suitable species, gaijan and dhakijam
showed the significant growth performance in mixture with sal as well as in mono-plantation.
Moreover, chakua koroi, motor koroi and udal can also be considered as good associates of this
suggested sal mixed plantation.
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Mature seeds of Uvaria cordata (Dunal) Alston were sown in polybag, nursery bed, propagator
house, and root trainer and investigated to find out the suitable media for raising seedlings for
conservation programs of species in Chittagong University Campus. The germination percentage,
germination index, germination value, shoot length, collar diameter, leaf number were assessed for
12 months old seedlings in the nursery. The germination percentage (92.31%), germination energy
(35.89%), and germination value (2.6493) were found the highest in T2 treatment (seed sown in
nursery bed) and significantly (p<0.05) different from other treatments except for To (polybag).
Maximum germination index (0.2713), germination uniformity (0.0039), and minimum
germination start time (30 days) observed in To (polybag), significantly (p< 0.05) different from
other treatments. After 12 months of germination, maximum shoot height (25.57 cm), collar
diameter (6.32 mm) and leaf number (16.40) revealed highest in T3 treatment. Seeds sown in
polybags were revealed comparatively better germination behavior than other treatments. Seeds
sown in root trainer were found suitable for vigorous seedlings production for Uvaria cordata.
Germination percentage of Tamarindus indica L. seeds were observed with 4
pre-sowing treatments viz, i) soaked in cow urine for 24 hours, ii) soaked in
cow dung slurry for 24 hours, ii) soaked in tap water for 24 hours, iv) soaked in
hot water (100 0 C) for 30 seconds and followed by one hour in tap water and v)
control, in the nursery of Bangladesh Forest Research Institute, Chattogram.
Growth performances of seedlings were also determined in nursery and field
conditions. The germination test was conducted in nursery bed filled with soil
and decomposed cow dung at a ratio of 3:1. The growth performance of
seedlings were determined by transferring the young seedling after 30-45 days
of germination having 5-6 leaves from germination bed to polybags (15 cm ×
23 cm) filled with soil mixed with cow dung. Growth performance in the field
was observed by out planting one year old seedling at 1.5 m × 1.5 m, 2.0 m ×
2.0 m and 2.5 m × 2.5 m spacing. Germination percentage was significantly
(p<0.05) influenced by pre-sowing treatments and highest germination
percentage (86%) was obtained in cow urine treatment for 24 hours and lowest
(44%) was found in hot water treatment. Growth performance of seedlings was
also influenced by pre-sowing treatments in the nursery and highest vigor index
was observed in cow urine treatment (3988) and lowest in hot water treatment
(1629). Survival percentage of seedlings was highest 98% at 2.0 m × 2.0 m
spacing in the field and average height was more than 68 cm after 12 months of
out planting. Therefore, pre-sowing treatment of seed in cow-urine for 24 hours
suggested for nursery raising and one old year seedlings may be planted at 2.0
m × 2.0 m spacing in the field for successful plantation of the species.
This experiment was conducted to evaluate the suitability of medium density fiberboard (MDF)
made from hybrid Acacia wood fiber as raw material and urea formaldehyde (UF) as resin binder.
Single layer fiberboards were fabricated by five different densities e.g. 700, 725, 750, 775 and 800
kg/m3 using hybrid Acacia wood fiber. Mechanical and physical properties including modulus of
rupture (MOR), internal bond strength (IB), thickness swelling (TS) and water absorption (WA) of
the fiberboards were tested according to the Indian Standard (IS 2380:1977). The results of the
physical and mechanical properties of the fiber boards were compared with Indian Standard (IS
12406: 2003), Euro Standard (D-6300, 1990) and American National Standards Institute (ANSI)
MDF standard (A208.2, 1994). The results showed that the 800 kg/m3 density fiberboards made
from hybrid Acacia wood had the best MOR value and maximum IB strength characteristics
among the others. For 800 kg/m3 density fiberboards the MOR value was above the Indian &
ANSI Standard but lower than the Euro Standard; and the IB strength value was above the Indian,
Euro & ANSI Standard specifications. Water absorption and thickness swelling properties were
used to determine the water resistance of the fiberboards.
Dendrocalamus giganteus is one of the biggest and largest bamboo of
Bangladesh which is locally known as bhudum bansh. The conventional
propagation methods of bamboos are not economically viable for large scale
production due to their scarcity of seeds, low multiplication rate, labor intensive
and high cost. In vitro propagation is becoming a promising tool for conserving
and mass propagation of different bamboo species. In this study establishment
of a reliable and reproducible protocol for the micro propagation of D.
giganteus from axenic culture of in vitro germinated seedlings has been
reported. Highest 83.33% seeds were germinated on MS (Murashige and
Skooge 1962) medium supplemented with 1.0 mg/L BAP (6-benzyl
-amino-purine) after 7 days of culture. MS supplemented with different
concentrations (0.0, 1.0, 2.0, 3.0 and 4.0 mg/L) of BAP and Kn
(6-furfuralaminopurine) at evaluated either singly or in combinations for
multiple shoot production. Maximum 16.33 numbers of young shoots per
culture were recorded in medium supplemented with MS + 3.0 mg/L BAP +
1.0 mg/L Kn + 4% sugar + 2.75 g/L after 28 days of culture. Rooting ability of
the shoots was assessed in half strength MS media supplemented with different
concentrations (0.0, 1.0, 2.0, 3.0, and 4.0 mg/L) of IBA (Indole-3-butyric acid).
The highest rooting percentage (66.67%) was achieved from the half strength
MS medium supplemented with 1.0 mg/L IBA 2 after weeks of culture. The
rooted plantlets were successfully hardened in soil under greenhouse and
nursery of Silviculture Genetics Division, Bangladesh Forest Research
Institute. The survival percentage of tissue culture plantlets in nursery was
found to be 90-95% after 60 days of acclimatization. The protocol developed
through this study enable to produce large number of D. giganteus bamboo
seedlings for mass propagation in a short period of time.
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Jarul (Lagerstroemia speciosa L. Pers., Family- Lythraceae) is a
semi-deciduous medium to large-sized tree with fluted bole, small buttress and
slightly flaky bark tropical flowering tree species. It is a common ornamental
tree planted along roadsides, gardens and parks in Bangladesh. The main aim of
this study is to develop mathematical models for total volume estimation of
jarul. To meet the quest we have tested 21 models for volume equation by
regression technique. The best-fitted model for studied species have been
selected by highest value of R2 (coefficients of determination), the lowest value
of Akaike Information Criterion (AIC) and Root Mean Square Error (RMSE).
The selected models also validated by Chi-square test of goodness of fit, Paired
t-test, Percent Absolute Deviation (%AD) and 45 degree line test. The study
appearance that, for one way analyses the model ln (V) = a+b ln (D) and for two
way analyses ln (V)= a+b ln (D)+c ln (H) appeared to the best model for
estimating the standing tree volume of jarul. Conversion factors equation has
been determined to estimate under bark volume and under bark volume of
different top end girth of 30, 35, 40 and 45 centimeters from these models. The
best-fit volume model showed the highest efficiency in volume estimation
compared to previous developed volume model of this species in terms of
Model Prediction Error (MPE), Model Efficiency (ME) and Root Mean Square
Error (RMSE).
Welcome to the Bangladesh Journal of Forest Science (BJFS) – a leading platform for advancing the knowledge and understanding of forest science in Bangladesh and beyond. Established with a commitment to excellence, BJFS serves as a cornerstone for researchers, practitioners, and enthusiasts dedicated to the sustainable management and conservation of forest ecosystems.
