Evaluation of the parameters of adaptivity of soft and hard wheat varieties using methods of mathematical analysis

The article presents calculating methods of a regression coefficient (bi), variances of stability (S2di), stress resistance (Ymin-Ymax), genetic flexibility (Ymax+Ymin/2), homeostaticity (Hom), and breeding value (Sc), which allow to carry out a comprehensive study of the source material and identify promising samples that combine high yield and resistance to abiotic environmental factors. Calculations allowed to identify plastic varieties of soft and hard wheat (Amurskaya 1495, Kuryer, Aryuna, Toronit, Ken Hong 14, Afina, Anka, Lastochka, Pallada, Nikolasha), stable and resistant to stress Khabarovchanka spring wheat variety, and spring wheat variety with a high breeding value – Feng Qlang 7, which can be used as parent forms for adaptability breeding.