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Yield Stability and Correlation Among Stability Parameters in Faba Bean (<i>Vicia faba</i> L.) Yield Trial in Ethiopia

The relationship between the adaptableness and stability estimates of different models is revealing of whether one or more estimates should be obtained for consistent forecasts of cultivar behavior, and also helps the breeder to select the best adjusted and most informative stability parameter(s). Twelve faba bean genotypes were assessed in 2018/2019 cropping season across seven environments in Ethiopia using randomized complete block design with four replications. The objectives were to identify stable faba bean genotypes across the target environments and determine the relationship among univariate stability parameters. The yield stability was estimated using various stability parameters. Using Eberhart and Russell’s model the regression coefficient (bi) values ranged from 0.85 (G5) to 1.08 (G3). The regression coefficient of G1 (bi = 0.99) and G11 (bi= 1.02) indicated average adaptable across environments. In contrast G2, G3, G4, and G8 have a regression coefficient bi value significantly greater than 1; this showed that genotypes are very sensitive when the environment is changed. To see the level of association among the parameters Spearman’s rank correlation was employed and the result showed highly significant positive rank correlation between cultivar mean performance Pi (r = 0.978) and mean seed yield. Shukula stability variance (ơ2) was significant positive rank correlated (r=1) with (ωi) indicating, the two stability parameters were similar for ranking purposes. Most of the univerate stability (ωi, ơ2, S2di, bi, ASV) parameters identified G8, G6 and G12 were stable and high yielder. Moreover, the experiment has to be repeated in multi locations to provide more reliable results and make recommendations for wide or specific adaptable genotypes in Ethiopia.