00000caa a22000003i 4500 UP-1685594773862388648 Buklod 20210323100657.0 m | | ta 210323s2019 xx r |||| u|eng d (iLib)UPBAG-00039569076 STII-DOST BAG rda eng ARTICLE-2829 Alipon, Marina A. author. Properties and utilization of young-age yemane (Gmelina arborea Roxb.) for lumber production by Marina A. Alipon, Elvina O. Bondad, Pablito L. Alcachupas, and Emelyne C. Cortiguerra. 2019. pages 237-248 illustrations 26 cm text rdacontent unmediated rdamedia volume rdacarrier Includes bibliographical references (page 248) This paper presents the lumber recovery and lumber grade yields; strength properties, namely modulus of rupture, stress at proportional limit, and modulus of elasticity in static bending; compression parallel- and perpendicular-to-grain; shear; hardness; and toughness, including the cost-benefits, of 4-, 6- and 8-year old yemane (Gmelina arborea Roxb.) for lumber production. The study was conducted to evaluate the effects of age and sites on these properties, recommend its end-uses, and evaluate the cost-benefits of converting the species at different ages for lumber production. The experimental materials consisted of three trees each from three sites in Caraga Region, Philippines, namely: Pating-ay, Prosperidad, Agusan del Sur (Site 1); Nong-nong, Butuan City (Site 2); and Las Nieves, Agusan del Norte (Site 3). Standard procedures for testing the abovementioned properties were followed. In the absence of lumber grading rules for industrial tree plantation species, individual boards were graded in green condition based on the U.S. National Hardwood Lumber Association standards. On the average, the 8-year-old trees obtained the highest average percent lumber recovery with 55.78%, 56%, and 54.89% for Site 1, Site 2, and Site 3, respectively. The trend of lumber recovery among sites also held true, with the 4- and 6-year old trees with values of 52% and 53.67% for Site 1, 51% and 53.33% for Site 2, and 51% and 52.11% for Site 3. Generally, the mechanical properties of 4-, 6-, and 8-year olds fell under moderately low (Class IV). All indicators show the viability of processing yemane from different diameters, ranging from 16.29 cm to 20.64 cm, belonging under 6- and 8-year-olds. (Author's abstract) Forestry. Cost-benefit. Lumber recovery and grades. Mechanical properties. Young-age gmelina arborea roxb. Cortiguerra, Emelyne C. author. Bondad, Elvina O. author. Alcachupas, Pablito L. author. The Philippine Journal of Science Vol. 148, no. 2, June 2019. Request full-text access via UPB University Library through https://forms.gle/KZjBv7aRtY6jiL5E9 (viewed 23 March 2021) FI UPBAG UPBAG-MAIN ARTICLE-2829 Analytics