Comparação de métodos de adaptabilidade e estabilidade relacionados à produtividade de grãos de cultivares de milho
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Data
2007-01-01
Autores
Cargnelutti Filho, Alberto
Perecin, Dilermando [UNESP]
Malheiros, Euclides Braga [UNESP]
Guadagnin, José Paulo
Título da Revista
ISSN da Revista
Título de Volume
Editor
Instituto Agronômico de Campinas
Resumo
Foram usados dados de produtividade de grãos oriundos de 34 ensaios de competição de cultivares de milho, realizados no Estado do Rio Grande do Sul nos anos agrícolas 2002/2003 e 2003/2004, com o objetivo de comparar os métodos de análise de adaptabilidade e estabilidade de: Yates e Cochran (1948), Plaisted e Peterson (1959), Wricke (1965), Annicchiarico (1992), Eberhart e Russell (1966), Tai (1971) e Lin e Binns (1988) modificado por Carneiro (1998). Para verificar as concordâncias e/ou discordâncias entre as estimativas dos parâmetros de adaptabilidade e estabilidade, obtidas pelos diferentes métodos, utilizou-se o coeficiente de correlação de Spearman. Cultivares indicadas pelos métodos de Plaisted e Peterson e Wricke estão associadas à maior estabilidade, porém independem da produtividade média e da adaptabilidade a ambientes gerais, favoráveis e desfavoráveis. Cultivares indicadas pelo método YATES e COCHRAN, estão associadas a maior estabilidade, menor produtividade e mais indicadas a ambientes desfavoráveis. Cultivares com alta produtividade e associadas à alta instabilidade e adaptada à ambientes favoráveis são as mais indicadas pelos métodos de Lin e Binns modificado por Carneiro e Annicchiarico. O método de Eberhart e Russell, por considerar simultaneamente a produtividade, a estabilidade e a adaptabilidade a ambientes gerais, favoráveis e desfavoráveis, deve ser a metodologia preferida.
Grain yield data were used from 34 maize cultivar trials carried out in the State of the Rio Grande do Sul, in the agricultural years of 2002/2003 and 2003/2004, with the objective of comparing the following methods of adaptability and stability analysis: Yates and Cochran (1948), Plaisted and Peterson (1959), Wricke (1965), Annicchiarico (1992), Eberhart and Russell (1966), Tai (1971) and Lin and Binns (1988) modified by Carneiro (1998). In order to verify the degree of agreement among the estimates of adaptability and stability parameters, the Spearman correlation coefficient was used. The cultivars indicated by the methodologies of Plaisted and Peterson and Wricke are associated with the highest stability. However they are independent of the average yield and of the adaptability to general, favorable and unfavorable environments. The cultivars indicated by Yates and Cochran method are associated with the highest stability, less yield and more appropriate to unfavorable environments. The cultivars with high yield and associated to high instability and adapted to favorable environments are preferably indicated by the LIN and BINNS modified by Carneiro and Annicchiarico methods. The Eberhart and Russell methodology must be preferred because of considering simultaneously the yield, the stability and adaptability to general, favorable and unfavorable environments.
Grain yield data were used from 34 maize cultivar trials carried out in the State of the Rio Grande do Sul, in the agricultural years of 2002/2003 and 2003/2004, with the objective of comparing the following methods of adaptability and stability analysis: Yates and Cochran (1948), Plaisted and Peterson (1959), Wricke (1965), Annicchiarico (1992), Eberhart and Russell (1966), Tai (1971) and Lin and Binns (1988) modified by Carneiro (1998). In order to verify the degree of agreement among the estimates of adaptability and stability parameters, the Spearman correlation coefficient was used. The cultivars indicated by the methodologies of Plaisted and Peterson and Wricke are associated with the highest stability. However they are independent of the average yield and of the adaptability to general, favorable and unfavorable environments. The cultivars indicated by Yates and Cochran method are associated with the highest stability, less yield and more appropriate to unfavorable environments. The cultivars with high yield and associated to high instability and adapted to favorable environments are preferably indicated by the LIN and BINNS modified by Carneiro and Annicchiarico methods. The Eberhart and Russell methodology must be preferred because of considering simultaneously the yield, the stability and adaptability to general, favorable and unfavorable environments.
Descrição
Palavras-chave
Zea mays, interação genótipos x ambientes, indicação de cultivares, correlação de Spearman, Zea mays, genotype x environment interaction, cultivar indication, Spearman correlation
Como citar
Bragantia. Instituto Agronômico de Campinas, v. 66, n. 4, p. 571-578, 2007.