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ThesisItem Open Access STUDIES ON WOOD CHARACTERISTICS USING Melia azedarach L. FRUIT EXTRACT AS A BIOPRESERVATIVE(2013) CHAUHAN, KANICA; SHARMA, K.R.ABSTRACT The present research entitled “Studies on wood characteristics using Melia azedarach L. fruits extract as a biopreservative” was carried out in the Department of Forest Products, Nauni, Solan (H.P.) 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 +.25cm x .15cm x .15cm ( longitudinally x radially x tangentially ) were got prepared. The wood specimens of Pinus roxburghii Sargent, Celtis australis L., and Bombax ceiba L. were dipped in 0.25, 0.5, 1.0, 1.5 and 2.0 per cent (w/v) Melia azedarach L. fruits extract solution for 72 hours. These were analyzed for variation in 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), weight gain, volumetric swelling coefficient, volumetric shrinkage coefficient, Swelling and Shrinkage of wood in three different planes, Chromium absorption, Chromium leaching, chromium retention and per cent fungus growth and per cent fungal inhibition. The maximum (0.570) value for specific gravity was recorded in Celtis australis L. and minimum (0.420) in Bombax ceiba L. Swelling and shrinkage of wood were recorded maximum in Pinus roxburghii Sargent in radial and tangential plane, while in longitudinal plane, maximum was recorded in Bombax ceiba L.The minimum swelling and shrinkage were recorded in Bombax ceiba L. in radial and tangential plane while, in longitudinal plane, minimum was recorded in Pinus roxburghii Sargent. Maximum volumetric swelling coefficient was recorded in Pinus roxburghii Sargent at 1.50 per cent concentration and minimum in Celtis australis L. at 2.00 per cent concentration. The highest volumetric shrinkage coefficient was recorded in Pinus roxburghii Sargent in control while the lowest in Bombax ceiba L. at 0.25 per cent concentration. The maximum per cent variation of treated and untreated wood on dry and wet weight basis had been recorded in Bombax ceiba L. and minimum in Celtis australis L. Maximum value for chromium absorption, leaching and retention were found at 10 per cent chromic acid concentration and minimum at 5 per cent concentration. The maximum (100%) fungus colonization was recorded in control for all the species. The minimum (38.33%) fungus colonization was recorded in Bombax ceiba L. at 2.00 per cent concentration. Highest (61.67%) fungus growth inhibition was recorded for Bombax ceiba L. at 2.00 per cent concentration and the lowest for control in all the species.