The purpose of the study is to evaluate the ecological plasticity of spring wheat varieties. Objectives: to evaluate the plasticity of spring wheat in terms of stress resistance, yield, ecological plasticity index, linear regression coefficient; to study the criterion of reliability and plasticity of spring wheat varieties. The location of the study is the Uyarsk GSU, located in the forest-steppe zone of the Krasnoyarsk Region. The objects of the study are 21 varieties of spring wheat, including 19 varieties of spring soft wheat of early ripening, mid-early, mid-ripening, mid-late groups and 2 varieties of spring durum wheat. For soft wheat, the Novosibirskaya 15 variety acted as a control in the early-ripening group of varieties, Altaiskaya 70 in the middle-early group, Altaiskaya 75 in the middle-ripening group, Lider 80 in the middle-late group, and the Oazis variety was the control among durum wheat varieties. A tendency to increase the yield from durum to soft varieties was revealed, among soft wheat varieties – from early ripening to mid-late group. In terms of the yield of soft wheat, the best results (more than 7.0 t/ha) were obtained in the varieties Extra (early ripening), Novosibirskaya 41 (medium-early), Gonets, Omskaya 44, Kuraginskaya 2, Predgornaya (mid-ripening), Lider 80, Union (medium-late), in terms of durum wheat productivity – Omskaya steppe. Data processing according to the method proposed by D.A. Saprygin, made it possible to carry out a comprehensive analysis and determine the plasticity of spring wheat varieties. Based on the results of such an analysis, it can be said that the highest reliability criterion (RC) is for soft wheat varieties of the early ripening group Novosibirskaya 15, Novosibirskaya 16; mid-early group Novosibirskaya 31, Novosibirskaya 41, Pamyati Vavenkov, mid-season group Gonets, Omskaya 44, mid-late group Leader 80, Belukha, Junior, as well as in the durum wheat variety Omskaya steppe.
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