Developing stable, high-yielding Egyptian cotton (Gossypium barbadense) cultivars that can adapt to changing weather patterns and rising temperatures is one of the main goals of cotton breeders. Nineteen genotypes of G. barbadense were evaluated for stable yield over five consecutive Kharif seasons from 2019 to 2024. Genotype-by-environment interactions contributed 96.2% of the variance, highlighting their importance. Genotypes G3 and G4 consistently performed well under all conditions, with high mean yields, according to the Additive Main Effects and Multiplicative Interaction model. As there were more interactions, the relative performance of genotypic values, the harmonic mean of the relative performance of genotypic values, and the harmonic mean of genotypic values were used to estimate the principal components of Best Linear Unbiased Prediction (BLUP)-based simultaneous selection. Genotypes G10 and G9 exhibited the highest anticipated means for number of bolls. Additionally, based on their stability indices, genotypes G10, G9, G2, and G18, were stable in number of bolls produced. Genotypes G9, G18, and G10 presented more bolls and greater stability based on the weighted average absolute scores of BLUP. BLUP was more accurate in determining the stability of the genotypes. In this study, G2, G3, and G13 cotton genotypes were found to be stable across all the models.
