Indian Journal of Genetics and Plant Breeding (The)

An Additive main effect and multiplicative interaction (AMMI) model was used to analyze grain yield data of 21 single cross maize hybrids evaluated at four locations in north-western Himalayas.Variation among hybrids for grain yield was found to be significant in each location. AMMI analysis of variance indicated significant variance for locations, hybrids and hybrids×locations interaction (H×L). The location main effect had largest contribution (52.79%) to the total sum of squares for grain yield followed by H×L interaction (28.16%) and hybrids (19.10%).The interaction component was further divided into interaction principal component axes (IPCA). Only first IPCA was found to be significant and accounted for 54.73% of the H×L variance. The second PCA was non-significant yet accounted for 26.16% variability of H×L interaction.The AMMI I analysis identified the nature and magnitude of interaction of each hybrids while AMMI II analysis identified the two hybrids namely, FH3594 and FH3609, which were moderately stable and promising across the north-western Himalayan environments.