Adaptability of winter wheat varieties in the Middle Volga region

11 varieties of winter soft wheat were analyzed for yield adaptability using various methods for calculating environmental plasticity and stability in 2012-2018. the Results of two-factor dispersion analysis showed a significant impact on the variability of yield of the environment factor (7 years of testing) - 96.89%, varieties (11 genotypes) - 2.45%, as well as the interaction between them, which is significantly lower, but also reliably-0.65%, at a 5% level of significance. Yields varied greatly depending on growing conditions and varieties from 13.7 C / ha (Kinelskaya 4, 2015) up to 62.4 C / ha (Erythrospermum 3730, 2017). A low level of variation was observed in the varieties Velutinum 3611, Velutinum 3751 and Povolzhskaya Niva in combination with a high level of homeostaticity. According to the coefficient of linear regression bi, the most plastic varieties are Kinelskaya 4, Erythrospermum 3730, Lutescens 3585, Lutescens 3645 and Konstantinovskaya. The varieties Povolzhskaya Niva (σ2d=1.68), Povolzhskaya 86 (σ2d=3.76) and Velutinum 3751 (σ2d=3.82) were stable according to the standard deviation (dispersion). By G. C. C. regression model. Tai stood out varieties Velutinum 3751, Povolzhskaya 86 and Povolzhskaya Niva. The varieties With high stability according to the method of S. P. Martynov include lutescens 3585, Povolzhskaya Niva, Velutinum 3611, Velutinum 3751, Konstantinovskaya and Erythrospermum 3730. Among all the studied varieties, the most plastic and stable in yield was the variety Povolzhskaya Niva. The variety has a relatively low coefficient of variation (29.2%), the highest level of homeostaticity in the experiment (31.22), a high average yield for the years of research (35.77 C / ha) and the standard deviation according to Eberhart and Russell (σ2d=1.68).