Phenotypic stability in cotton genotypes in Mato Grosso State, Brazil

Abstract

Eight cotton genotypes, three lines and five cultivars, were evaluated for estimation of phenotypic adaptability and stability parameters relative to cotton yield using the method proposed by Eberhart and Russell. Twelve yield trials, in randomized complete blocks, comprising eight replications, were carried out in 11 locations of the Mato Grosso State, during the 2000/2001 crop season. All the genotypes showed determination coefficient above of 85%, except Delta Opal. For the estimates of adaptability, all the genotypes presented broad adaptation (bi = 1). The genotypes CNPA ITA 90, BRS Antares, CNPA 96-124, CNPA 96-283 and BRS Aroeira showing hight stability (s²_di= 0). The best genotypes, characterized by higher yield, stability and broad adaptability, were CNPA ITA 90, BRS Aroeira and CNPA 96-124.