Comparação de métodos de adaptabilidade e estabilidade relacionados à produtividade de grãos de cultivares de milho

Abstract

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.

Adaptability and phenotypic stability of semi-prostate cowpea genotypes in Mato Grosso do Sul

“…Thus, the BRS Xiquexique, genotype recommended for unfavorable environments by the Eberhart and Russell (1966) method, is more stable according to the traditional method, besides obtaining above overall yield mean of testing. These results confirm those obtained by Cargnelutti Filho et al (2007, 2009, who, when comparing methods for estimating the adaptability and stability of maize genotypes, found that genotypes indicated by the traditional method have greater stability, being more suitable to unfavorable environments by the Eberhart and Russell (1966) method.…”

“…Thus, amongst the evaluated genotypes, MNC99-541F-15 proved to be the most stable, in addition to the fact that its grain yield is above the overall average of trials and it is also recommended by the Eberhart and Russell (1966) Cargnelutti Filho et al (2007, 2009) also assess the association between these methods for indicating the most productive maize genotypes.…”

Rapeseed population arrangement defined by adaptability and stability parameters

“…It should be pointed out that there could be different responses between the methods of estimation of adaptability and stability (Cargnelutti Filho et al, 2007) as observed in the present study. This is somehow expected, since the method of Wricke (1965) indicates that the stability does not depend on mean yield and adaptability to general environments, favorable and unfavorable, contrary to the model of Eberhart & Russell (1966).…”

“…The parameters of adaptability and stability contribute to management adjustments and better recommendation of cultivars. This is observed in species of agricultural interest, such as corn for grain production (Cargnelutti Filho et al, 2007), oat for the content of betaglucan (Crestani et al, 2010) and soybean for oil and protein contents in the seeds (Rodrigues et al, 2014). Table 3.…”

“…The model of Wricke (1965) employs the methodology called ecovalence, which decomposes the sum of the squares of the interaction into parts attributed to each genotype and considers as the most stable the one with the lowest estimate of ecovalence (ω i ) (Cruz & Carneiro, 2003). The models of Wricke (1965) and Eberhart & Russell (1966) have been used in various studies with grain-producing species, such as in Silva & Duarte (2006) with soybean, Cargnelutti Filho et al (2007) with corn and Pereira et al (2009), with bean.…”