Estratificação de ambientes para seleção de híbridos de milho

Abstract

The genotype and environment interaction can be defined as the effect of the environment under the genotypes. In this context, the current paper goal is to compare different genotypes in different environments in order to identify possible interactions. It was analyzed7 hibrid's females and 6 environments characterized by the altitude and location. The methodology used in this paper is the model AMMI (Additive main effects and multiplicative interaction) that combines in one model, additive parameters for the main effects, and multiplicative effects for the interactions. The database is from the summer seasons from 2011 to 2016 of the corn seed production of a private company. The years were considered as the repetitions and the compared variable were the productivity in 60.000 bags/hectare. Through the biplot chart for the first principal component, it was possible to analyze the genotype s stability. Therefore, it presents that, among the analyzed genotypes, the G1, G3, G4, G5 and G6 can be considered as stable genotypes, since their scores are between the limits of the confidence interval built for the scores s averages. However, the genotypes G5 and G6 would not be a good indication, because, although they were considered stable, they have very low productivity averages compared to the others. In addition, it was possible to analyze the genotype adaptability in each environment through the scores product of the genotypes and environments. Therefore, it was possible to conclude that the G4 and G7 genotypes have a favorable adaptation in the A1, A2 and A4 environments. On the other hand, the G1, G2, G3, G5, and G6 genotypes have a better adaptation in the A3, A5 and A6 environments