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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:

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.

The operational mechanism of the project is also discussed. The major problems of the model have been outlined. The model, if properly developed may substantially contribute towards salving national problems like unemployment, poverty, food and forest products deficits by depicting a way of optimum utilization of the hitherto unproductive Unclossed State Forests, Protected Forests and hilly khas lands of the country.

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 oftwenty 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 (Bischofia 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 bee 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.

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 decandra), 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.

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.

Abstract:

Top shoot borer damage causing high mortality to cane in the cane arboretum of Bangladesh Forest Research Institute is reported. The causal pest was identified as Ommatolapus hacmorrhoidalis (Wiedemann ) (Curculionidae : Coleoptera). The nature and extent of damage by the pest and susceptibility of different species of cane, viz., jai or jali bet (Calamus guruba), karak or kirink or- baro bet ( C. viminalis var. fasciculatus), bhudum bet (C. latifolius) and golak or golla bet (Daemonorops jenkinsianus) to the pest were studied. Jali
bat was found to be highly susceptible to the attack of the pest showing 62.7±4.62% shoot infestation whereas the other species were resistant to the attack of this pest.

Abstract:

Ground-layering and air-layering trials were carried out on bariala (Bambusa vulgaris) and muli bansh (Melocanna baccifera)during April and May, 1982. All the treated branches of B. vulgaris produced successful propagules in the air-layering experiment. The ground-layer in a of twelve culms (2 years old) of the same species also produced 23 rooted and rhizomed propagules. Initiation rooting and rhizome appeared only in the branches of mid-culm zone in both of the layering experiments, M. baccifera did not respond to any of the layering methods.

Growth and development of each of the propagules of B. vulgaris planted in the field are being recorded to determine the time required for attaining the marchantable culm size.

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