Extra-early maize cultivars offer a means to reduce the losses from recurrent drought stress in sub-Saharan Africa but limited knowledge on the stability and adaptability of these genotypes offer some set back on their importance. Therefore, the aim of this study was to assess the stability and adaptability of tropical extra-early maize genotypes for grain yield and key agronomic traits in Ghana. Thirty-three regional extra-early single cross hybrids from IITA and two standard checks were evaluated in RCBD at Nyankpala, Yendi and Manga. Combined analysis of variance indicated that there was significant (P< 0.01) differences among Genotypes (G), Environments (E) and G X E interactions for grain yield. Percentage contribution of mean square variance for environments (86.65%) was higher than the contribution of both genotype (9.79%) and genotype x environment (1.99%). Genotypes EEWH-2 (1), EEWH-30 (4), 10C3333-2 (33), and *EEWH-59 (27), *EEWH-48, and *EEWH-56 were the most stable with above average performance. In contrast, genotypes 11C5060 (30), *EEWH-52 (20), *EEWH-44 (12), *EEWH-57 (25), and Dodzi (35) were the least stable but high yielding hybrids. Yendi was identified as the most ideal environment even though Nyankpala produced the highest genotype yield during the evaluation.
Keywords: Adaptability, Extra-early, Genotype, GGE, Ghana, Stability