GGE Biplot Analysis of Multi-environment Yield Trials of Durum Wheat (Triticum turgidum Desf.) Genotypes in North Western Ethiopia

Abstract

This experiment was done to identify the most stable durum wheat genotype(s) as well as desirable environment(s) for durum wheat ( Triticum turgidum var. durum Desf.) research in north western Ethiopia. Grain yield performance of the tested genotypes were evaluated at four locations (Adet, Debretabor, Gaint and Simada) using randomized complete block design with three replication for two consecutive years (2010 and 2011). Combined analysis of variance showed that grain yield was significantly affected by environments (E), genotypes (G) and GE interactions. The first two principal components (PC1 and PC2) were used to create a two - dimensional GGE biplot and explained 45.67% and 32.71 % of the total sums of squares of GE interaction, respectively. The ‘which - won where’ feature of the GGE biplot suggested that the existence of three durum wheat mega