Grain yield data for5 improved varieties (Tórtola-INIA, Cuyano-INIA, Araucano 85-INIA, and Coscorrón - INIA) and 4 non improved varieties (Tórtola corriente, Burros Argentinos, Frutilla Corriente and Coscorrón corriente), were obtained from 9 environments and used to characterize the perfotmance of these varieties, considering mean grain yields, response to environments (measured through .Iinear regression) and stability of yield (measured through deviation from regression) (Eberhart y Russell, 1966). Cuyano-INIA, Burros Argentinos and Tórtola corriente showed the highest yields. Cuyano-INIA showed an ave(age response to varying environments and its performance was much more predictable than other varieties. In contrast, Tórtola corriente and Coscorrón corriente showed unstable performances, with high response to favorable environments. Burros Argentinosshowed high stability.Widely adapted toenvlronn'lentswere Coscorrón-INlA and Frutilla corriente. The non improved Tórtola type performed consistently better than theimproved one in all the environments with favorable conditions. However, for Coscorrón type the improved variety performed as well as the non improved one. Suaves-85, consistently showed tlle lowest performance.