Abstract

This study aimed to assess adaptability and stability of different wheat cultivars on different sowing dates in western region of Paraná, Brazil. The assay was composed by following wheat cultivars: CD 154, CD 1252, CD 108, CD 151, CD 1550, CD 104, CD 1440, CD 116, CD 150, and CD 1104, which were sown on three different dates: April 29th 2014, May 20th 2014, and June 26th 2014. The methods used to determine stability and adaptability of production were: Traditional, Lin and Binns adapted by Carneiro, Eberhart and Russell and the Integrated. There was an agreement between Eberhart and Russell and Integrated methods for cultivars CD 104, CD 151, CD154 and CD 1440, which have general adaptability. It was also noted an agreement between methods of Lin and Binns and Eberhart and Russell on stability of cultivars CD 108, CD 1104 and CD 1440. The cultivars CD 108 and CD 1440 are considered stable and with wide adaptation and may be indicated to Western Paraná, regardless of sowing date. The cultivar CD 1104 may be indicated to be sown between April and May, while the CD 150 may be suitable for the later sowings, in late June.

Key words: Eberhart and Russell, integrated method, Lin and Binns, traditional method.

Abbreviation

β1, Regression coefficient; CBPTT, Comissão Brasileira de Pesquisa de Trigo e Triticale; Cfa, temperate or subtropical hot summer climates; Coodetec, Cooperativa Central de Pesquisa Agrícola; CV, coefficients of variation; Embrapa, Empresa Brasileira de Pesquisa Agropecuária; P_i, genotypic performance; R², coefficient of determination; δ, regression deviation.