Identificación de variedades de maíz sobresalientes considerando el modelo AMMI y los índices de Eskridge

this study was carried out in 2004 at metepec, el cerrillo piedras blancas (two sowing dates), and jocotitlán, towns located in the toluca-atlacomulco valley, in the state of mexico; the main objective was to identify high yielding maize (zea mays l.) genotypes by using the additive main effects and multiplicative interaction analysis model (ammi), four eskridge's criteria, and the genotype by stability index analysis. at each location, twenty-five varieties were sown in a randomized complete block design with four replications. the combined analysis of variance was computed for this series of experiments over locations. the analysis with the ammi model show that environment, genotype, genotype by environment interaction, and the first principal component in the pca analysis were highly significant (p<0.01). only 2% of total sum of squares of the ammi model was assigned to the model's residual. the ixtlahuaca variety (check) outperformed palomero toluque？o in 2.3 t ha-1, and outyielded the lowest and highest cacahuacintle yielders by 2.3 and 1.48 t ha-1, respectively. chalque？o, eta 13, cóndor, h-33, h-40, h-44, and h-90e outperformed the check variety from 1.0 to 2.25 t ha-1. the ammi model, the four eskridge's criteria, and the genotype by stability index analysis identified chalque？o, h-33, h-40, hit-3, san lucas, and vs-46e as stable varieties, and only the first three outyielded (p<0.01) the check variety and the overall mean; palomero toluque？o and cacahuacintles 4 and 5 were classified as unstable varieties and show a yield significantly lower (p<0.01) than the check and the overall mean.