R. K. Torvi , G. S. Kariyappa , K. M. Satishchandra

Abstract

To determine the optimum spacing that gives maximum production of high est quality pulpwood in the shortest time, a spacing trial was established in Pinus tecunumanii during 1988 using 1 m × 1 m, 2 m × 2 m, 2.5 m × 2.5 m, 3 m × 3 m, 3.5 m × 3.5 m, 4 m × 4 m and 5 m × 5 m spacings. Data collected upto end of 8th year are presented in this paper. Analysis of data indicated that height was not affected by different spacing while Diameter at Breast Height (DBH) was highest at widest spacing and lowest at closest spacing. Further, Height to DBH ratio decreased with increase in spacing indicating a lower Form-Factor at wider spacing. Total Stand Volume per hectare and Mean Annual Volume Increment (Mal) were highest in 1 m × 1 m spacing and decreased with increase in spacing. In 1 m × 1 m spacing there is intense competition between trees which resulted in high mortality and thin trees producing small quantity of pulpwood whose extraction is expensive and uneconomical. In other spacings, trees are distributed in diameter classes that produce pulpwood of desirable size. Considering volume production and distribution of trees in different diameter classes, maximum production of pulpwood is anticipated at 2.5 m × 2.5 m spacing which gives a planting density of 1,600 plants per ha at the rotation period of 12 years.

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K. M. Satishchandra , G. S. Kariyappa , S. Nagaraj , G. K. Shenava

Abstract

There is an ever increasing demand for long fibre forest raw material due to depletion of Bamboos by the paper industry in India. Fourteen provenances of Pinus caribaea var. hondurensis and six provenances of Pinus tecunumanii were tested in the site to find out the desirable provenances for higher and sustainable productivity. Growth parameters assessed indicated that the differences in height and dbh were not significant for the provenances of Pinus caribaea var. hondurensis while the differences were significant for the provenances of Pinus tecunumanii. Growth comparison under field conditions indicated that the site conditions are ideally suited for the growth of Pinus caribaea var. hondurensis where as they are hotter than that of native habitat for Pinus tecunumanii and hence Pinus caribaea var. hondurensis is grown on large scale and Pinus tecunumanii is considered as secondary species. 4H and 13H Queensland provinces, Mt. Pine Ridge provenance from Belize, and La Brea, Bros Laguna, Los Limones, Tierra Blanca and Culmi provenance from Honduras of Pinus caribaea var. hondurensis are desired for bigher and sustained productivity.

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