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R. Vijendra Rao , P. Kumar , R. Sudheendra , S. R. Shukla , S. K. Sharma

Abstract

Culms representing before, during and after flowering phases were subjected to testing for certain strength properties in round and split forms. Round bamboo showed higher values in compression parallel to grain in culms before flowering phase, while static bending values were higher in culms during flowering phase. In split bamboo, strength properties (maximum crushing strength and static bending) were more in culms of after flowering (air-dry) phase than before and during flowering phase (green).

Keywords

Bambusa bambos, Culms, Strength Properties, Gregarious Flowering

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P. Kumar , S. R. Shukla , R. Sudheendra , M. Sujatha , S. Shashikala , S. K. Sharma , A. K. Sethy , R. Vijendra Rao

Abstract

Based on tests conducted on small clear specimens of timber, the physical and mechanical properties of E. citriodora are reported and discussed. The safe working stresses and suitable indices have also been evaluated and compared with those of Tectona grandis. Based on suitability coefficients, E. citriodora has been recommended for utilization for several end uses.

Keywords

Eucalyptus citriodora, Physical and Mechanical Properties

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R. Vijendra Rao , S. C. Gairola , S. Shashikala , A. K. Sethy

Abstract

Bamboo occupies a prominent place in the socio-economic and cultural life of Indians. It has been a source of number of uses since ancient times. India is the second largest in bamboo production with the highest growing stock concentrated in the North-East states. This paper outlines the consumption pattern of different species of bamboo in various sectors like agriculture, aquatic environment, socio-religious functions, sericulture, agarbathi industry and furniture. It also emphasizes the importance of research on bamboo improvement programme to produce better quality material in terms of physico-mechanical properties and the role of training in efficient utilization of this unique raw material.

Keywords

Bamboo, Utilization, R&d, Training, Southern India

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R. Vijendra Rao , S. Shashikala , P. Sreevani , V. Kothiyal

Abstract

The basic density and anatomical properties of five clones of Eucalyptus tereticornis developed by ITC Bhadrachalam are reported. Tbe five clones represented by four trees each, of 4-5 year old were from Sarapaka demonstration plot, Andhra Pradesh, India. Intra-clonal variation was significant in basic density, vessel diameter, vessel element length, fibre length, fibre diameter, fibre wall thickness, while variation in tissue proportions were non-significant. However, inter-clonal variation was significant for all the parameters. Basic density was positively correlated with vessel diameter and percentage of rays, while girth had a negative influence on fibre diameter and fibre wall thickness. Fibre length, fibre diameter and fibre lumen diameter were positively inter-correlated, while negative correlations were observed among the tissue proportions. Vessel diameter was also correlated positively with ray percentage and negatively with vessel percentage. All these correlations are suggestive of spatial adjustments in quantitative characteristics among different cell types.

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R. Vijendra Rao , M. Sujatha

Abstract

Wood structure of Semecarpus kathalekanensis Dasappa & Swaminath, a new species identified recently from Southern India, is described in detail. Wood is greyish yellow, moderately hard, light in weight, coarse textured and straight and silver grained. It is a diffuse porous wood with indistinct growth rings. Vessels are large with simple perforation and large intervessel pitting. Parenchyma is paratracheal with no crystals and fibres are thin walled and rarely septate. Rays are 1-3 seriate and heterocellular. The wood structure resembles with Semecarpus anacardium and Semecarpus travancorica but for the rare occurrence of septate fibres.

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Satish Kumar Sinha , M. S. Deepak , R. Vijendra Rao

Abstract

Investigations on tree ring analysis in Tectona grandis Linn (teak) from Western Ghats showed the presence of crescent, elongate and triangular-shaped scars as evidence of wounds due to insect, fire damage and nail penetration. Insect wounds remained open and restoration of disrupted cambium took five to six years. In cross section, most discs displayed little callus tissue. Fire scars were identified by the presence of charcoal around the scars and elongated scars were due to nail penetration. Each of these are potential sources to establish a relationship with dendroecology.

Keywords

Dendroecology, Scars, Wound, Dendrochronological Technique

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R. Vijendra Rao , R. Dayal , R. D. Raturi

Abstract

Wood Anatomy of the Indian Myristicaceae viz. Gymnacranthera, Horsfieldia, Knema and Myristica has been described in detail. The study indicates that the four Indian genera can be easily distinguished from each other on the basis of their wood structure. Woods of some foreign genera both African and American have also been investigated for a better understanding of their relationship with the Asiatic members Of the family and to confirm certain observations made by earlier workers. The occurrences of reticulate, irregular anastomosing type of vesselperforations in Pycnanthus and scalariform type in Cephalosphaera (both African genera) has been recorded for the first time Observations also show that oil cells and crystals in the rays are completely lacking in the, African and Indian representatives. Other observations which are contrary or in agreement to the findings of the earlier workers have also been recorded.

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R. Dayal , R. Vijendra Rao

Abstract

no abstract

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