The aim of the work was to study the ecological plasticity of soft spring wheat. To achieve this goal the following tasks were defined: to evaluate varieties of soft spring wheat by yield, elements of environmental plasticity and stability, using the principle of ranking varieties, to evaluate their adaptability to environmental conditions. Varieties of soft spring wheat «Altaiskaya 70», «Kanskaya», «Novosibirskaya 15», «Novosibirskaya 29», «Novosibirskaya 31», «Novosibirskaya 41», «Omskaya 32» and «Vavenkov’s memory» were the objects of research. The parameters of ecological plasticity and stability (bi, σ) were calculated using the method of S. A. Eberhart and W. A. Russell, the homeostatic index (Hom) was calculated using the formula of V. V. Khangildin, and stability parameters of spring wheat were calculated using the method of E. D. Nettevich. The varieties «Kanskaya», «Omskaya 32», «Altaiskaya 70»realized their yield potential in the conditions of the variety testing area to a greater extent. Comparison of different methods for evaluating varieties for stability and plasticity showed that their resolution was not the same. The most complete information is provided by the use of several methods, while it is more convenient to use the principle of ranking varieties by all parameters and to evaluate them by the sum of points. Under contrasting growing onditions, the varieties showed different adaptive properties in terms of yield. It responded to improvements in growing conditions well and reduced yields in adverse conditions to a lesser extent.

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