DUTT, BHUPENDERBHATT, SEEMA2016-07-212016-07-212016http://krishikosh.egranth.ac.in/handle/1/69100ABSTRACT The present research entitled “Comparative studies on wood quality parameters of exotic and native species of Shorea Roxb. ex C.F. Gaertn.” was carried out in the Laboratory and Wood Workshop in the Department of Forest Products, College of Forestry, Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan (HP) during 2013-15. The study revealed significant variation between physical, mechanical and chemical characteristics of wood of exotic and native species of Shorea. Among different physical characteristics Sal registered maximum specific gravity (0.681) with medium texture. The longest fibre length was noticed in Light Red Meranti (1222.24 µm) while maximum fibre diameter (31.14 µm) was found in Teak respectively. Maximum vessel element length and vessel element diameter was recorded in Dark Red Meranti as (630.09 µm) and (230.75 µm). The maximum Vessel frequency was found in Yellow Meranti (8.21), respectively. The maximum ray height was recorded in Light Red Meranti (845.63 µm) and maximum ray width was observed in Teak (82.91 µm). Among mechanical properties of wood of exotic and native species of Shorea, the maximum tensile and bending strength was recorded in Sal as (0.145 kN/mm2) and (0.101 kN/mm2). The maximum compressive strength parallel and perpendicular to grain was noticed in Sal as (0.051%) and (0.0049 kN/mm2). The maximum modulus of elasticity and maximum modulus of rupture was recorded in Sal as 18007.25 MPa and 124.78 MPa, respectively. Among chemical properties of exotic and native species of Shorea, significant variation was observed for those parameters studied. The maximum cold and hot water extractives were found in Teak i.e. (6.48 %), (8.25 %), and maximum alcohol benzene extractives was observed in Sal (8.35%), respectively. Maximum Holocellulose and lignin content was recorded in Teak (69.72%) and Sal (30.71%), respectively. Correlation studies revealed that specific gravity has a significant positive relation with MOE, MOR, Static bending and compression parallel to grain. Fibre length shows a highly significant positive relationship with MOE and MOR. The number of vessels per field of view gave highly significant positive correlation with compression and tensile strengths. Highly significant positive correlation were obtained between holocellulose and specific gravity, compression strength parallel to grain, tensile strength and static bending. Lignin contents were positively related with MOR and compression strength parallel to grain. Regression analysis revealed that linear and quadratic function fitted best to predict the different mechanical properties.eniaa, planting, vegetative propagation, biological phenomena, concentrates, vegetables, biological development, regeneration, farmyard manure, auxinsexotic and native species of Shorea Roxb. ex C.F. Gaertn, wood qualityThesis