Yield stability analysis of nine spring bread wheat genotypes in the central highlands of Ethiopia
2010
Eight promising bread wheat lines and one standard check cultivars were
evaluated for grain yield performance, stability and adaptation across
nine environments of the central highlands of Ethiopia. Results of the
combined analysis of variance for grain yield showed highly significant
effects of genotypes, environments, and genotype by environment
interaction. The mean grain yields for individual lines ranged from
3249 to 4762 Kh ha-1. When the genotypic grain yields were subjected to
stability analysis against an environmental index, the regression
coefficients for individual lines ranged from 0.406 to 1.451. Among the
lines tested, HAR 1696 and Enkoy were the two most stable genotypes
across all environments, while two of the four highest yielding lines,
HAR 1349 and HAR 1709, appeared to be specifically adapted to favorable
growing conditions. The test line HAR 1685 exhibited superior yield
performance across all environments, and was recommended for release in
1994 for commercial production in Ethiopia.
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