Abstract:
Genotype by environment interaction (GEI) is a major complication in plant breeding. An assessment of
genotypes across diversified environment and season is important for releasing of varieties. The
objective of the study was to evaluate the effects of GEI in fourteen NERICA rice genotype and their
adaptation in two years at three locations in the production year 2009 and 2010. The trial was laid out in
randomized complete block design with three replications. The combined analysis of variance revealed
significant (P<0.01) environments, genotypes and genotype by environment interaction effect and
environment captured 91.4% of the total variability. The additive main and multiplicative interaction
further explained the genotype by environment interaction by decomposing in to two significant
interaction principal components. The fourteen rice genotypes were best explained by the additive
main effects and multiplicative interaction (AMMI) 1 that gives model fitness of 98.1%. The polygon view
of the Genotype and genotype by environment interaction (GGE) bipolt analysis showed that the
environments fall in to two sectors and the genotype NERICA 4 was wining genotypes in all of the
environment except E4 (Gomma, 2010). The additive main effect and multiplicative interaction biplot 1
and polygon view of the GGE (Genotype and genotype by environment interaction) biplot showed that
the genotype NERICA 4 were consistently higher yielder in all the environments in the study.
