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Objetivou-se com esse estudo avaliar a viabilidade da combinacao de metodos parametrico e nao-parametricos para inferir acerca da estabilidade de cultivares de soja no cerrado tocantinense. Para isso utilizou-se os dados de ensaios de competicao conduzidos em quatro ambientes nas safras de 2009/10 e 2010/11 e na entressafra de 2010. Utilizou-se o delineamento em blocos casualizados com quatro repeticoes. As estimativas de estabilidade foram obtidas pelo metodo parametrico sugerido por Livorenti e Matsuoka e pelos metodos nao-parametricos propostos por Huenh e Fox. Pelo metodo parametrico, os cultivares M8766, M9056, P98Y70RR, M9144RR, JulianaRR e BRS8560RR acumularam o maior numero de sinais positivos nos ambientes avaliados, sendo que os dois ultimos apresentaram sinal negativo em um ambiente. Pela metodologia nao-parametrica foram discriminados como produtivos e estaveis apenas os quatro primeiros cultivares. Neste sentido, houve concordância na discriminacao de cultivares produtivos e estaveis por ambos os metodos, desde que desconsiderados aqueles que apresentam sinal negativo entre os ambientes avaliados.  Assim, a combinacao dessas metodologias alem de apresentar simples aplicabilidade, mostra-se viavel para inferir acerca da estabilidade e produtividade de cultivares de soja para o estado do Tocantins. Combination of parametric and nonparametric methods for stability study of soybean cultivars in the from Cerrado Tocantinense Abstract: The objective of this study was to evaluate the viability of combining parametric and nonparametric methods to infer about the stability of soybean cultivars in the cerrado from Tocantins state. Were used data from competition experiments conducted in four environments in crop 2009/10 and 2010/11 and between crop of 2010. A randomized block design were used with four replications. Estimates of stability were obtained by the parametric method suggested by Livorenti and Matsuoka; the nonparametric methods proposed by Huenh and Fox et al. For the parametric method, the soybeans cultivars M8766, M9056, P98Y70RR, M9144RR, JulianaRR and BRS8560 accumulated the highest number of positive signs in the environments, whereas the latter two cultivars had a negative sign in one environment. For nonparametric methodology were discriminated as productive and stable only the first four cultivars. In this sense, there was concordance in discriminating cultivars productive and stable for both methods, since those who have ignored the negative sign between the environments evaluated. Thus, the combination of these methods and presents simple applicability, seems viable to infer the stability and productivity of soybean cultivars for the state of Tocantins .

Combinação de métodos paramétricos e não-paramétricos para estudo da estabilidade de cultivares de soja no Cerrado Tocantinense