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 Este trabalho teve por objetivo avaliar a associação entre as respostas de alguns métodos de adaptabilidade e estabilidade por meio da técnica multivariada: análise de correspondência. Foram utilizados dados provenientes de um experimento sobre produção de matéria seca de 92 genótipos de alfafa (Medicago sativa) realizado em blocos ao acaso, com duas repetições. Os genótipos foram submetidos a 20 cortes, no período de novembro de 2004 a junho de 2006. Cada corte foi considerado um ambiente. As estimativas de adaptabilidade e de estabilidade de produção foram obtidas pelos métodos de Eberhart e Russell (1966), Cruz, Torres e Vencovsky (1989), método centróide ampliado e Lin e Binns (1988). Após a análise de associação, verificou-se que a técnica de análise de correspondência mostrou-se eficaz para o estudo da associação e capacidade de discriminação das respostas dos métodos de adaptabilidade e estabilidade. As respostas desfavorável (D) e desfavorável imprevisível (DI) associadas aos métodos de Lin e Binns (1988) e Eberhart e Russell (1966), respectivamente, são discrepantes em relação às outras respostas obtidas por estes métodos. Dentre todos os métodos avaliados os que possuem maior associação entre as respostas são os métodos de Eberhart e Russell (1966) e Cruz et al. (1989).This study aimed to evaluate the association between responses obtained using methods of adaptability and stability by using correspondence analysis. The forage yield of 92 genotypes of alfalfa (Medicago sativa L.) was investigated. The trial had a randomized block design, with 2 replicates, and the data were used to test the reliability of the different methods. Twenty cuttings were obtained from each genotype between November 2004 and June 2006. Each cutting was grown in a different environment. The estimates of adaptability and stability were obtained using the methods of Eberhart and Russell (1966), Cruz, Torres and Vencovsky (1989), Nascimento et al. (2009b), and Lin and Binns (1988). Following the association analysis, correspondence analysis was conducted for determining association and discriminating the responses obtained using the methods of adaptability and stability. The unfavorable (D) and unpredictable unfavorable (DI) responses obtained using the methods of Lin and Binns (1988) and Eberhart and Russell (1966), respectively, were discrepant in relation to other responses obtained using these methods. The greatest association between responses was confirmed using the methods of Eberhart and Russell (1966) and Cruz, Torres and Vencovsky (1989)

Association between responses obtained using adaptability and stability methods in alfalfa