Analysis of Turpentine and Rosin of High Resin Yielders and Check Trees in Chir Pine (<I>Pinus roxburghii</I> Sargent)

Abstract

Studies were conducted to investigate the high resin yielders (HRYs) and check trees in Chir pine (Pinus roxburghii Sargent) for turpentine and rosin characters. The data on turpentine content, specific gravity of turpentine, relative flow rate of turpentine and rosin content exhibited significant variation in different high resin yielders and check trees in Pinus roxburghii, whereas the specific gravity and ash content of rosin were found to be nonsignificant. The maximum turpentine percentage was obtained in Ghandir-2 HRY (27.10%) and minimum turpentine was noticed in Chabal-check (18.50%). Highest specific gravity (0.8878) and relative flow rate (1.427) of turpentine was recorded in UHF-check and Chabal-check respectively, while lowest specific gravity (0.8415) and relative flow rate (1.378) of turpentine was noticed in Ghandir-2 HRY. The maximum rosin percentage was recorded in UHF-check (78.60 %) and minimum in Ghandir-2 (69.65%) HRY, whereas specific gravity and ash content of rosin ranged between 1.0301 to 1.0498 and 0.28 to 0.41 per cent, respectively. From this study it can be concluded that highest percentage of turpentine with lowest specific gravity of turpentine and rosin, relative flow rate of turpentine and ash content of rosin are the characteristic feature of high resin yielders and therefore, these parameters may be kept in mind while designing the selection indices for high resin yielders.