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
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.
Kraft pulping of whole jute plant without retting was conducted in the laboratory scale. Compared with kraft pulping of bamboo, the unbleached pulp yield with unretted jute plant was lower by about 3.0 percent points at the same point of delignification. The yield was lower by 17.0 percent points compared to kraft pulping ofjute bast fibre. Jute plant pulp degraded severely on bleaching. However, the quality of unbleached pulp was almost similar to kraft bamboo pulp. Whole jute plant can thus replace bamboo in making papers which do not require bleaching.
During March-April, 1989 a sample survey was conducted on the attack by stcmborcr in the kcora (Sonneratia apetala) plantations of Chittagong, Noakhali, Barisal and Patuakhali Coastal Afforestation Divisions. The survey was made in the plantations established from 1967 to 1985 covering 76,624 ha land. The purpose of the survey was to estimate the overall intensity of infestation in different Coastal Afforestation Divisions as well as to establish relationships of the infestation will) some other parameters.
A point sampling method was followed for the survey. The results showed that stocking of kcora trees per hectare was 1645 of which 851 were
infested by stcmborcr. The overall infestation was estimated to be 52% with an average of 61%, 59%, 45% and 44%. in Barisal, Patuakhali, Noakhali and Chittagong Coastal Afforestation Divisions respectively. Intensity of infestation was graded into three groups, viz., slight, moderate and severe. Severely attacked portion showed the highest infestation (22%) compared to tiic slightly (13%) and moderately attacked trees (17%).
A number of qualitative characters, such as plantation composition, plantation age, canopy density and total inundation duration were studied
towards their degree of association with the infestation. Age of die plantations did not show any correlation with the intensity of infestation while inundation duration and plantation composition had significant effects on it.
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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