Genotype and environment (G x E) interaction was estimated in 40 oil palm dura x pisifera progenies, evaluated at six locations for yield and its components. The presence of G x E interaction was detected for yield and its components. The G x E variance component was relatively small and ranged from 3.53% to 4.12%. The result showed that fresh fruit bunch (FFB) yield had a larger G x E variance component (σ²_gl) than genetic variance component ( σ²_gl), indicating that this character was very sensitive to the environment. The joint regression analysis showed that the linear regressions accounted for a small proportion of the total G x E interaction. This suggests that a non-linear component part of G x E interaction for the characters played an important role.
The combined use of all the stability determination methods could provide a better interpretation of individual stability of genotypes. Combined use of 10 stability statistics for FFB yield indicated that progenies DP8 and DP21 were highly stable genotypes, which also produced above average FFB yield. On the other hand, progenies DP7 and DP30 were the most unstable genotypes as indicated by all the stability parameters