IMPROVEMENT THROUGH SELECTION OF PLUS TREES IN GMELINA ARBOREA

摘要

The genetic improvement of Gmelina arborea, a native of north-eastern India was investigated. A total 60 plus trees of G. arborea were selected from the states of Assam, Amnachal Pradesh and Mizoram using point grading method of selection. Superiorityof these plus trees over the comparison trees was 18.77, 20.68 and 46.48% for height, girth at breast height (gbh) and clear bole height (cbh) respectively. Plus trees selected from the state of Arunachal Pradesh showed maximum improvement for gbh (31.52%) and cbh (67.28%) whereas plus trees from Mizoram attained maximum improvement for height (25.22%).