An evaluation of stability of thirty Arabica coffee genotypes was carried out across different environments. The interaction of genotype by environment (G x E) across the different environments was highly significant. Both heterogeneity of regression and pooled deviation mean square from regression were highly significant. On this basis stability analysis was done using regression and AMMI models. On the basis of the analyses, different sets of genotypes were found as stable by the two models. Genotypes 7803A and 7803B, which were at the 13 th and 14 th ranks from thirty genotypes, were found as stable by the regression model. On the other hand genotypes 8143, 75187B and 8019, which were at the second, third and seventh ranks, were found as stable by the AMMI model. The discrepancy noticed in the two models in indicating the stable genotypes was largely attributed to their differences in accounting the interaction sum of squares. The result of the study is considered as one remarkable success in the history of Arabica coffee research as identifying stable genotype for multi-locations / diverse environments has long been a major challenge and in practice able for decades.
Evaluation of 30 Arabica coffee genotypes was carried out at four different locations in south-westernEthiopia to identify genotypes that exhibits stable performance across wide environments. The analyses of variances revealed that yield differences among genotypes were highly significant at all locations in both seasons except at Jimma during the second season. The interaction was also highly significant. Six genotypes: 8211, 808, 8219, 75187B, 8143 and 8213 exhibited higher overall mean yield that ranged from 1217 to 1633 kg of clean coffee per hectare at the first two bearings. Such mean yield is very high as climax yield in Arabica coffee is attained starting from the fourth bearing stage. However, only three of these genotypes: 8213, 8143 and 75187B exhibited superior performance consistently at all locations irrespective of the interaction. The result of the trials is considered as one remarkable success in the history of Arabica coffee research as identifying genotype that exhibits stable performance across wide environments has long been a major challenge and in practicable for decades.
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