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BANGLADESH JOURNAL OF FOREST SCIENCE

A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute

ISSN - Print: 1021-3279 | Online: -
Abstract:

Only a fair price of jute for the
growers can ensure its sustained supply for
the industries or for export. Multifarious
uses and vigorous export promotion drives,
in their turn, can keep the demand of
jute to the desired level. Thus, a project
was undertaken for making paper-pulp
from jute using a process to give a higher
yield compared to the conventional kraft
process, yet retaining the kraft like properties.
The success of such a project is
likely to open the possibility of a perpetual
high demand of jute in the industrial sector.

Abstract:

Conventional soda pulping results in lower pulp yield and
strength properties. It also needs a much longer cooking time. To
overcome these difficulties a study on the effect of anthraquinone
( AQ ) in the alkaline pulping of Acacia auriculiformis was conducted.
The result showed that 3.1 percent point yield gain was achieved in
the soda pulping with 0.05% AQ addition. The yield was comparable
to that of the kraft control. Further increase of AQ did not substantially
increase the yield. In kraft-AQ pulping the gain in yield
was less remarkable, although 1.4 percent point gain was obtained.
Addition of AQ can substantially reduce the alkali requirement ?.nd/
or duration of cooking. The quality of the AQ catalysed pulp was
in no way inferior to the kraft control.
The feasibility of using AQ in a soda pulp mill in Bangladesh
has been shown. It indicates a remarkable economical gain.

Abstract:

A community Forestry Project was initiated in 1980 in the
Protected Forest land at Pomra in the district of Chittagong. So
far, 126 landless families have been rehabilitated in 24 groups in the
project area by allotting 1.62 ha of denuded hills to each family.
Most of the families took loans from the Bangladesh Krishi Bank
for procuring inputs with the help of the Forest Department to
amounts ranging from Tk 1,000 to Tk 4,000. The paper discusses
the state of development of horticultural and forest plantations in
these plots, and the improvement of the standard of living and
socio-economic status of these families. The cropping pattern, inputoutput
ratio, Land Expectation Value and employment intensity have
been reported on the basis of a survey conducted on 24 families out
of 126.

Abstract:

The flowering nature of Bambusa balcooa Roxb. has been described.
It was observed that it flowered giegariously in the clump
but sporadically over the area. The clump died after flowering without
setting any seed. The flowering cycle has been speculated to be
40 ±5 years.

Abstract:

A series of charges of twenty timber species were dried employing
solar drying as well as the conventional air drying and steam heated
kiln drying methods. Solar and air drying were continued for
three years during the entire drying seasons. The results suggest
that the climatic conditions of Bangladesh are suitable for operating
greenhouse type solar kilns throughout the year. Even refractory
timbers of higher dimensions can be dried during the rainy season
to a desired lower moisture content. The quality of the solar dried
timber is found to be superior to both air and kiln dried timber.
Solar drying is significantly more efficient than air drying. It is a
simpler and less expensive drying technique than kiln drying. It is
recommended that the solar drying technique be employed in wood
based industries for effectve utilization of Bangladeshi timber.

Abstract:

Fibre dimension studies of five Bangladeshi woods, namely,
Moluccana koroi (Albizia falcataria), kainjal ( Bischof ia javanica},
jialbhadi (Lannea coromandelica’), narikeli (Pterygota alata) and chundul
(Tetrameles nudiflora) wets carried out to find out their suitability
in paper making. From the data, Runkel ratio, flexibility co-efficient
and relative fibre length, which influence certain pulping properties,
were deduced. Attempts were made to correlate fibre dimensions to
pulping properties of certain species namely, Moluccana koroi and
Kainjal. Considering the fibre length and certain anatomical
characteristics, the potentiality of narikeli for pulping has been
suggested. It is concluded that fibre dimensions along with pulping
properties and the manufacturing processes should be the guiding
principles in evaluating the suitability of the species in paper making.
1. Presented

Abstract:

Pestalotia sp., a fungal pathogen causing leaf blight disease of
pony al ( Calophylum enophylum Linn.), was isolated. The finding
was confirmed by the artificial inoculation of healthy leaves ofpanyai
plants with the isolated pathogen. Besides, the average quantitative
incidence and infection index of the disease on naturally infected
plants during 1976-1978 were estimated.

Abstract:

Of the 10 M m2 of raw hides produced annually in Bangladesh
only a fifth is tanned by 175 odd tanneries, using imported tanning
materials. Vegetable tannins can be extracted from roughly 10,000
tors of mangrove barks available annually at the felling coupes in
the Sundarbans. Amelioration of the properties of these tannins is,
however, a precondition to their use as tanning materials.
Tannins were extracted by various methods from goran {Ceriops
decandr a), kankra (Brugiera gymnorrhiza) and passur {Xylocarpus
molluccensis) barks collected from the Sundarbans. The percentages
of tannins obtained were 24, 21 and 17 respectively. A method was
developed for overall purification and improvement of colour and
quality of tannin. Chemical analysis indicates that the tannin is of
catechol group and quantitative analysis of the extractives shows that
the production of mangrove tannins would be an economically viable
proposition. Tanning experiments with goat skin show that light coloured
and fine-grained uppers and soles can be made with the purified tannins.
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Abstract:

The main economic aspects of the family Ve benaceae in relation
to the major categories of uses such as timber, medicine, food,
fodder, ornamental, insecticide, dye and live fences in Bangladesh
have been reviewed. Other passible uses have also been noted.
The medicinal uses are grouped disease wise. A checklist of Bangladesh
species with the indication of their economic uses has been appended.

Abstract:

Present seed use (11 kg for a nursery bed of 1.2 m x 12 m)
for kcora {Sonneratia apetala Buch.-Ham.) was found to be at least
55 times higher than the actual requirement for producing usable seedlings
in the Chittagong coastal area. No significant difference was
observed in respect of availablility of seedlings when pregerminated
and ungerminated seeds were sown. Seeds sown by broadcasting
showed significantly better performance than dibbling.

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