Ailo Valmir Saccol

ANÁLISE DE ESTABILIDADE FENOTÍPICA DE CULTIVARES DE SOJA EM 28 AMBIENTES DO RIO GRANDE DO SUL

Yield data of 21 soybean variety from trials conducted in 28 environments in the Rio Grande do Sul State were used for a stability analyses using the discontinuous bi-segmented model (STORCK, 1989) with corrections due to errors in the variables. The main conclusions were: 1) The method was adequate for phenotype stability studies of soybean varieties since there was a wide environmental variation and a good data adjustment to the model; 2) The group of varieties can be considered as undesirables (Hill, IAS-2, Parana, Prata, Sel. Foscarin, Louisiana, Hardee, Bienville, Industrial, Santa Rosa, Bossier and Vicoja); b) Adaptable to both unfavorable and favorable environments, within the region studied (Perola, Bragg and Jakson); c) Adaptable to favorable environments (Planalto, Hale-7, IAS-5, IAS-1 and IAS-4); d) Adaptable to average environments (Hood).