Studies on Growth Behaviour of some Bambusa tulda Roxb. Plus Clumps

Thirty-two Bambusa tulda plus clumps were selected using the selection index method and assembled at the germplasm bank of Rain Forest Research Institute, Jorhat. The plus clumps were from different geographical regions of Assam and Meghalaya. Growth study of selected plus clumps in the germplasm bank revealed significant differences among genotypes (at P<0.05 level) for all the parameters height, dbh, and age. The Duncan Multiple Range Test (DMRT) grouped the plus clumps into 15 groups on the basis of height and the plus clump RFRI/BT/511 from Madhavpur of Jorhat district was found to be the best performer (l3.35m), while the plus clump RFRI/BT/502 from Sonapur of Kamrup district was found to be the least best performer. Further, the Duncan Multiple Range Test grouped the plus clumps into 12 groups on the basis of the dbh, with the plus clump RFRI/BT/509 from Balijan, Titabor of Jorhat district (95.32 mm) as the top performer and the plus clump RFRI/BT/502 from Sonapur of Kamrup district as the least best performer. Correlation study showed positive correlation between height and dbh and height was negatively correlated with that of age. A multiple regression model for prediction of height using dbh and age was established.