GENOTYPE X ENVIRONMENT INTERACTION AND ITS STABILITY IN <em>ACACIA</em> <em>MANGIUM</em>

Abstract

Five provenances of Acacia mangium were used to establish provenance trials at five locations, namely Sabal, Jakar, Oya Road, Labang and Sawai Forest Reserves in Sarawak. The provenances were Broken Pole, Cassowary, Piru Ceram, Rex Range and Sidei. Plot means of each provenance were subjected to joint regression analysis using height and diameter growth. Location, provenance and interaction between provenance.and location effects were significant. Provenances Piru Ceram, Rex Range and Sidei were found to be stable in their response to different locations while Broken Pole and Cassowary were unstable. Hence, the former provenances were expected to give an average response to various locations while the latter were more suitable for good locations only.