GGE-Biplot Analysis of Grain Yield of Faba Bean Genotypes in Southern Ethiopia

A Genotype x Environment (GxE) interaction study was conducted in Southern Ethiopia in 2007 and 2008 using 16 faba bean genotypes in a randomized complete block design with three replications. The objectives of the study were to determine the magnitude of G x E interaction and to identify high yielding and stable or specifically adapted genotypes for target environment(s). A GGE-Biplot was used to analyse G x E interaction and stability of the genotypes based on the trait grain yield (kg ha⁻¹). Genotypic difference was found to be significant (P < 0.05) and (P < 0.001) for each environment and across environments, respectively. Location main effect was also highly significant (P < 0.001), but year main effect was not significant. Genotype x Locations (GL) and Location x Years (LY) were significant. Genotypes G3 and G8 were specifically adapted to Hossana and Waka while G11 was specifically adapted to Angacha and Bule. G5 was the most stable genotype with wider adaptation to all the test environments and can be recommended for wider production in similar high land environments of the Southern Region of Ethiopia.