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
Soybean is a small genus of twining and sub—erect harbs, distributed throughout the tropics of Asia, Africa and Australia. Soybean, also called Chinese bean, is considered one of the most important cultivated legume and is one of the five sacred grains, rice, soybean, barley, wheat and millet, essential to the existence of Chinese civilization. It is learnt from the ’Meteria Medica’ written about A.D. 450 that soybean was not paisonous but regarded as a specific remedy for proper functioning of heart, liver, kidney, stomach and bowels. It was also used as a stimulant
for lungs, for eradication of poisons from the system, improvement of complexion and stimulant for growth of hair. It is also called poor man’s meant due to its high protein content (2).
The production of soybean which for many centrries was confined to the countries of Asia, spread rapidly to the rest of the world and in recent years, it has attained great importance in the U.S.A, as a raw material for industry. Cultivation of soybean has gained momentum in all the American countries and in the U.S.S.R., Rumania, Bulgaria, Yugoslovia, etc. However, attempts to popularise soybean in India as pulse was not met with success due to the presence of other widely used pulses.
In recent years, we have become used to soybean oil which is comparatively cheaper. Now, if cultivation of soybean is introduced in our country, we can meet our demand of edible oil, which has become a scarce material. Once it is grown abundantly, it will then surely find other uses as raw meterials of industries.
This paper deals with the effect of two growth hormones, IAA and IBA in the rooting response of stem cuttings, rooting of branches by air layering through the application of Seradix B-3, and bud and cleft graftings of six species in different months. It was found that rooting occurred in four species with hormone applications to stem cuttings ; of these, three species rooted throughout the year. In air layering, four species roofed only in August-September. Bud grafting were successful in all the species. Bud propagation in April-May was the most successful. Fair results
were also obtained from budding in November-December. Cleft grafting did not show much response in any of these species.
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The paper outlines the forest products and forest management research works so far undertaken at the Forest Research Institute of Bangladesh in order to evaluate their contributions in accelerating the process of structural transformation of the economy of Bangladesh. It is observed that forestry and forest industrial research can play a vital role in generating economic forces for big push which is an essential prerequisite for breaking the vicious circle emanating from the dual character of the economy. Attention is given to provide a qualitative assessment of flow of spread effects from forest research to the overall productivity of the economy. Major problem of research management is pointed out in order to develop background discussion for a research diffusion model compatible with the national goal of optimum rate of structural change.
Experiments to determine the role of wounding and fungal infestation in the formation of the aromatic base, agar, in the wood of Agar tree
(Aquilaria agallocha Roxb.) were conducted. Inoculation with wounding using three fungal isolates from agar, as well as, wounding without inoculant, produced colour changes and oleoresin deposits, in the host characteristic of agar. It was inferred that the formation of agar did not depend on the activity of a special fungus, as was previously believed, but is a general reaction of the host to injury or invasion.
The possibility of the development of techniques for the commercial induction of agar in A. agallocha is discussed.
Some species of bamboos produce flowers once in their life and die after flowering. The seeding cycle is said to be 6 to 120 years. Some other species produce flowers annually throughout the year and do not die after flowering. In order to keep record on the nature of flowering of bamboos, Government of India issued a circular in 1893 which has Gupta, M. L. S. 1952. Gregarious flowering of Dendrocalamus strictus. Ind. For. 78 : 547-550 Gupta, K. K. 1972, Flowering of different species of bamboos in Cachhar district of Assam in recent times. Ind. For. 98 : 83-85 Scngupta, M. L. 1939. Early flowering in Dendrocalamus strictus. Ind. For. 65 : 583-585 been incorporated in Bangladesh and other Forest Manuals ( Hasan 1973 ). For Bangladesh, there is no regular report of the flowering of bamboos. Hasan (1973) reported and analysed the flowering of 5 species of Bangladesh bamboos which flowered till 1973. Banik (1979) reported the flowering of “Baijjya Bansh” (Bambusa vulgaris Schradex Wendl).
Bandarhola (Duabanga sonneratioides) heartwood was treated with 40 : 60 creosote petroleum oil mixture by the Lowry empty cell process using different schedules and the effects of varying pressure, treating time and final vacuum period on penetration and absorption were studied. This species, inspite of presence of tyloses in the vessels, was highly permeable to the preservative mostly along the grain. Transverse penetration from the surface was, however, low. The reason for higher permeability along the grain is attributed to the presence of numerous intervessel pits with perforated pit membranes. Increasing pressure and treating time increased penetration and absorption. At 82°C preservative temperature, saturation in absorption was reached in about 120 minutes. Final vacuum recovered about 25 per cent of the absorbed preservative, leaving the rest in the wood as net retention.
Loranthaceac includes semiparasitic plants which are known as mistletoes. In Bangladesh mistletoes attack a large number of hosts, viz., Gamar, Teak, Sal, Mango, Jackfruit and many ornamental plants. In the country 15 species under 7 genera of Loranthaceae have been recorded and their distribution have been discussed. The important hosts of mistletoes have been listed. A critical review on the biology and control of mistletoes has been presented. Attention has been drawn to generate adequate studies for appropriate control of the parasites in our context.
The applicability of kiln drying schedules developed earlier were verified for 5 cm thick planks of thirty indigenous hardwood species. A series of charges were kiln dried covering the entire specific gravity range under four classes. It was found that the kiln schedules developed earlier for thinner stocks were equally effective in drying thicker ones. Five cm thick planks of different species having similar Specific gravity range in different classes may, therefore, conveniently be kiln dried using the recommended schedules.
This paper considers forest inventory from mathematical points of view. Several text-book results have been proved mathematically. Also, a possible mathematical definition of time of felling of a tree has been suggested. Finally, using the results of this investigation, the mathematical model presented by Choudhury and Chowdhury (1983) has been examined and an alternative model has been proposed.
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