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Genotype and Environment Interaction and Marketable Tuber Yield Stability of Potato(Solanumtuberosum L)Genotypes Grown in Bale Highlands,Southeastern Ethiopia

Fufa Miheretu

Twelve potato (Solanumtuberosum L.) genotypes were evaluated using randomized complete block design (RCBD) with three replications to evaluate their genotype x environment interaction (GEI) and marketable tuber yield stability across nine environments during 2009-2011 at highlands of Bale, Southeastern Ethiopia. The combined analysis of variance (ANOVA) revealed that there was significant (p<0.05) variation in genotype x environment interaction in marketable tuber yield. Genotype, environment and genotype x environment interaction respectively explained 18.86%, 51.88% and 29.26% of the total sum of squares in marketable tuber yield (t/ha). Most of the total sum of squares in marketable tuber yield is contributed by environment. The AMMI analysis for marketable tuber yield (t/ha) indicated that IPCA1, IPCA2 and IPCA3 were highly significant (p<0.01) while IPCA4 showed non-significant interaction. The first and second principal component axis captured 40.37% and 30.8% of the GEI sum of squares in marketable tuber yield. Genotype 394640-539 gave high mean marketable tuber yield that is the most stable across environments. It was, thus, selected and recommended for wide production across locations.