STUDIES ON WOOD CHARACTERISTICS USING Nerium oleander L. EXTRACT AS A WOOD BIOPRESERVATIVE
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Date
2016
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UHF,NAUNI
Abstract
ABSTRACT
The present research entitled “Studies on wood characteristics using Nerium oleander L. extract as a wood biopreservative” was carried out during 2014-2015 & 2015-2016 in the Department of Forest Products and in the Department of Plant Pathology, Dr. Y.S. Parmar University of Horticulture and Forestry (Nauni) Solan (HP). Wood samples of Pinus roxburghii Sargent, Celtis australis L. and Bombax ceiba L. of the sizes 5 cm x 2.5 cm x 2.5 cm + .25 cm x .15 cm x .15 cm (longitudinally x radially x tangentially) were prepared. These wood specimens were dipped in Nerium oleander L. leaf extract solution for 72 hours in different concentrations of 0.25, 0.5, 1, 1.5 and 2 per cent (w/v). These were analyzed for variation of specific gravity, per cent weight gain of treated and untreated wood on dry weight basis (swelling), per cent weight gain of treated and untreated wood on wet weight basis (shrinkage), per cent oven dry weight gain before and after treatment, volumetric swelling coefficient, volumetric shrinkage coefficient, swelling and shrinkage of wood in three different planes, Chromium absorption (%), Chromium leaching (%), Chromium retention (%), per cent fungus growth and per cent fungal inhibition. The maximum value (0.569) for specific gravity was recorded in Celtis australis L. and minimum (0.428) in Bombax ceiba L. showing significant difference. Swelling and shrinkage of wood were recorded maximum in Pinus roxburghii Sargent in longitudinal plane, radial and tangential plane. The minimum swelling was recorded in Bombax ceiba L. in longitudinal, radial and tangential plane, while minimum shrinkage was observed for Bombax ceiba L. in longitudinal plane and Celtis australis L. in radial and tangential plane. Maximum volumetric swelling (12.21%) and shrinkage (8.45%) coefficient was recorded in Pinus roxburghii Sargent and minimum volumetric swelling coefficient (8.87%) in Bombax ceiba L. while minimum volumetric shrinkage coefficient (6.98%) in Celtis australis L. The maximum per cent variation of treated and untreated wood on dry and wet weight basis were recorded in Bombax ceiba L. and minimum in Celtis australis L. Maximum value for Chromium absorption (%), leaching (%) and retention (%) were found at 10% chromic acid concentration and minimum at 5% concentration. The maximum fungus colonization (100%) was recorded in control for all the species. The minimum fungus colonization 16.66% was recorded in Pinus roxburghii Sargent at 2.00% concentration and highest fungus growth inhibition 83.34 % was recorded at the same concentration for Pinus roxburghii Sargent
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