S. K. Purkayastha , S. P. Agrawal , R. D. Tandon , Laxmi Chauhan

Abstract

The variation in the proportion of heartwood has been studied in 89 years old Eucalyptus tereticornis Sm. trees, raised in four different plantations viz. Haldwani, Shahdol, Bangalore and Coimbatore. The heartwood volume calculated from its propogation in various discs, has been found to be significantly affected by the locality of growth; within a locality it is correlated with the girth at breast height.

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K. Ramesh Rao , S. K. Purkayastha , R. D. Tandon

Abstract

Study of several consecutive growth rings in two samples of teak from Mysore and Kerala showed no definite relationship between ring width and proportion of tissues. The two samples also showed significant differences in proportion of tbaues though the average rate of growth is comparable.

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S. K. Purkayastha , R. D. Tandon , K. Ramesh Rao

Abstract

Anatomical studies of some tested samples of teak from seven different localities have shown that fibre wall thickness is highly correlated with specific gravity. This relationship is influenced to some extent by the proportion of fibres. Highly significant correlation has also been found to exist between fibre wall thickness and maximum crushing stress in the samples in which the wall thickness is less than 4μ.

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S. K. Purkayastha , R. D. Tandon , K. Ramesh Rao

Abstract

Study of some increment cores from 36-year-old teak trees from four seed origins grown in South Coimbatore, indicates that seed source may have a significant effect on the density of the mature wood. Increment cores from trees of two of the seed origins were also studied from another locality viz. Nilambur. Analysis of the data from these two localities suggests that the influence of environment on wood density may be greater than that of seed origin.

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