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Spring barley is a key grain-fodder and feed crop, which forms an increased yield (in comparison with other grain-fodder crops) due to early maturity  and drought resistance. Many different methods for assessing environmental plasticity and stability have been developed, they are reliable and informative.  The purpose of this study is a comparative characteristic of plasticity and stability parametres calculated with application of various methods on the example  of barley varieties. The experimental part of the work was carried out in 2013-2017 on the experimental fields of the Omsk Omsk Agrarian Scientific Center  (southern forest-steppe, Omsk). The parametres of ecological plasticity were calculated: Ymin-Ymax - resistance to stress,   - compensatory ability  (according to Rossielle, Hemblin); CV is the coefficient of variation (according to Dospekhov); K.A. - coefficient of adaptability (according to Zhivotkov’s meth- od); bi - coefficient of linear regression of productivity of varieties (according to Eberhart, Russell). Also, parametres of environmental stability are as follows:  SI - stability index, Hom - homeostaticity (according to Khangildin); PVSL - parametre of variety stability level (according to Nettevich); σ2 d  – regression coeffi- cient (according to Eberhart, Russell). The research results show that the parametres of plasticity and stability of varieties calculated by various methods differ  significantly. Obviously, it is necessary to use a methodology that will bring all the scattered results to a single denominator. In this case, it is more convenient  to use the principle of ranking varieties according to parameters and to evaluate them according to the sum of the ranks obtained by each variety. Thus, ac- cording to the rank assessment, the most stable and plastic are varieties that received this assessment according to most of the methods used in the research.

EFFICIENCY OF APPLICATION OF VARIOUS METHODS FOR PLASTICITY AND STABILITY CALCULATION OF VARIETIES ON THE EXAMPLE OF SPRING BARLEY