STUDIES ON WOOD CHARACTERISTICS USING Parthenium hysterophorus L. EXTRACT AS A WOOD BIOPRESERVATIVE
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Date
2013
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ABSTRACT
The present investigations entitled “Studies on wood characteristics using Parthenium
hysterophorus L. extract as a wood biopreservative” was carried out in the Department of Forest Products,
Nauni, Solan (H.P.) Products and also in the Laboratory of Fruit Pathology in the Department of Mycology and 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 size 5cm x 2.5cm x 2.5cm ( longitudinally x radially x tangentially ) were taken for the study. The wood specimens of Pinus roxburghii Sargent, Celtis australis L., and Bombax ceiba L. were dipped in 0.00%, 0.25%, 0.5%, 1%, 1.5% and 2 % (w/v ) Parthenium hysterophorus L. extract solution for 72 hours. These were analysed for variation of specific gravity, per cent weight gain of treated and untreated wood on dry weight basis, per cent weight gain of treated and untreated wood on wet weight basis, weight gain, volumetric swelling coefficient, volumetric shrinkage coefficient, Swelling and shrinkage of wood in three different planes, chromium absorption, chromium leaching, chromium retention, per cent fungal growth and per cent fungal inhibition. The maximum value of specific gravity was recorded in Celtis australis L. (0.576) and minimum in Bombax ceiba L. (0.432) showing significant difference.Swelling and shrinkage of wood were recorded maximum for Pinus roxburghii Sargent in all the planes viz.,longitudinal, radial and tangential plane. Maximum volumetric swelling coefficient was recorded for Pinus roxburghii Sargent wood at 1.5% concentration and minimum for Celtis australis L. at 0.25% concentration.The volumetric shrinkage coefficient was recorded highest for Pinus roxburghii Sargent in control and lowest for Bombax ceiba L. at 1.5% concentration. The maximum per cent variation in weight of treated and untreated wood on dry and wet weight basis had been recorded in Bombax ceiba L. wood in control and minimum in Pinus roxburghii Sargent at 0.25% and Celtis australis L. at 0.5% concentration. The mean values of oven dry weight for different treatments increased with the increase in concentration upto 1.5% at par with 2% concentration. The highest value was recorded in Bombax ceiba L. at 2% concentration and the lowest in Bombax ceiba L. in control. Maximum value for chromium absorption, chromium leaching and chromium retention found at 10% chromic acid concentration and minimum at 5% chromic acid concentration. Maximum fungus colonization were recorded in control (100%) for all the species and Pinus roxburghii Sargent at 0.25% concentration. The minimum fungus colonization in Bombax ceiba L. was found at 2% concentrations (48.38%). Highest fungus growth inhibition was recorded for Bombax ceiba L. at 0.25% concentration (7.25 %) and the lowest for control in all the species and for Pinus roxburghii Sargent at 0.25% concentrations.