Estratificação e dissimilaridade ambiental em genótipos de milho no Tocantins, com adubação e safras distintas

The aim was to evaluate the stratification and environmental dissimilarity effect in corn genotypes,in relation grain yield and green weight of plant, at Tocantins, they were used the fertilizationmanagement and season as factors of distinction the environments. They were conducted eightexperiments with experimental design completely randomized blocks, with 16 genotypes and tworeplications, each one. The green weight of plant was evaluated at the flour grain stage and, thegrain yield, after physiological maturation. The environmental stratification was done by Lin (1982)method. The environmental dissimilarity was done by Cruz & Castoldi (1991) method, and it wasobtained the simple e complex fraction of GxE interaction, in addition was estimated the Pearsoncorrelation between the pair of environments. The complex fraction was represented, for bothcharacteristics, 90% of GxE interaction. The fertilization management and the season were effectiveto provide distinction conditions of genotype development.
O objetivo foi avaliar o efeito da estratificação e dissimilaridade ambiental em genótipos de milho, quanto a produção de grãos e de massa verde da planta, no Tocantins, usando manejo de adubação e safra como fatores de diferenciação dos ambientes. Foram conduzidos oito experimentos em delineamento de blocos casualizados com 16 genótipos e duas repetições, cada. A massa verde da planta foi avaliada no estágio de grãos farináceos e, a de grãos, após a maturação fisiológica. A estratificação ambiental foi realizada segundo o método de Lin (1982). A dissimilaridade ambiental foi estimada pelo método de Cruz and Castoldi (1991), com obtenção das frações simples e complexa da interação GxA, além da correlação de Pearson entre os pares de ambientes. A fração complexa representou, para ambas as características, 90% da interação GxA. O manejo da adubação e a safra foram eficazes em proporcionar condições distintas de desenvolvimento dos genótipos. Stratification and environmental dissimilarity in corn genotypes at Tocantins, withdifferent fertilizations and seasonsAbstractThe aim was to evaluate the stratification and environmental dissimilarity effect in corn genotypes,in relation grain yield and green weight of plant, at Tocantins, they were used the fertilizationmanagement and season as factors of distinction the environments. They were conducted eightexperiments with experimental design completely randomized blocks, with 16 genotypes and tworeplications, each one. The green weight of plant was evaluated at the flour grain stage and, thegrain yield, after physiological maturation. The environmental stratification was done by Lin (1982)method. The environmental dissimilarity was done by Cruz & Castoldi (1991) method, and it wasobtained the simple e complex fraction of GxE interaction, in addition was estimated the Pearsoncorrelation between the pair of environments. The complex fraction was represented, for bothcharacteristics, 90% of GxE interaction. The fertilization management and the season were effectiveto provide distinction conditions of genotype development.