STUDIES ON PROPERTIES OF CONIFEROUS WOODS AVAILABLE IN THE MARKETS OF HIMACHAL PRADESH
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Date
2016
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UHF,NAUNI
Abstract
ABSTRACT The present research investigation entitled “Studies on properties of coniferous woods available in the markets of Himachal Pradesh” was carried out in the department of Forest Products, College of Forestry, Dr Y S Parmar university of Horticulture and Forestry, Nauni, Solan (HP) during the years 2013-2014, 2014-15 and 2015-16. Chemical analysis was carried out by employing TAPPI (Technical Association of Pulp and Paper Industry) standard methods. The mechanical strength properties were determined on UTN-10 (Universal Testing Machine) by standard procedures. The results revealed that moisture content (34.67%) and specific gravity (0.532) were found to be maximum in Cedrus deodara from Solan and Abies pindrow wood, from Sundernagar, respectively. The tracheid length (3.97 mm), tracheid diameter (50.01 µm) and ray width (32.05 µm) were recorded to be highest in Pinus roxburghii and ray length (0.680 µm) in Cedrus deodara wood collected from Chamba market. Maximum number of resin ducts (0.831/mm2) and fusiform rays (10.583/ mm2) were found in Pinus wallichiana from Sundernagar and Chamba markets, respectively. Whereas, uniseriate rays (44.97/mm2) were highest in Abies pindrow wood from Solan market. The wood samples of Pinus roxburghii collected from Solan market have shown maximum cold water solubility (7.18%), hot water solubility (8.88%), alcohol-benzene extractives (11.94%) and lignin content (30.68%). The holocellulose content (68.75%) was found to be highest in Pinus wallichiana wood from Solan market. The maximum tensile strength (0.057kN/mm2) and bending strength (0.003kN/mm2) were recorded in Pinus roxburghii from Solan. The compressive strength (0.110kN/mm2) and modulus of elasticity parallel to grain (0.031kN/mm2) were highest in Pinus wallichiana while, compressive strength (0.048kN/mm2) and modulus of elasticity perpendicular to grain (0.019kN/mm2) had largest values in Cedrus deodara from Solan. Modulus of Rupture (0.069kN/mm2) and Bending modulus of elasticity (0.070kN/mm2) have been found to be highest for Cedrus deodara samples from Solan and Sundernagar markets, respectively. Out of 336 combinations of simple correlation coefficients, 59 were found to be positive and significant while, 13 were found to be negative and significant. The value of regression coefficient R2 has been noticed to be highest for specific gravity for different mechanical-chemical (0.96) as well as mechanical-physical (0.99) parameters under study.
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