Yurieva Natalya I. RussiaВоронежVoronezh Federal Agrarian Research Center named after V. V. Dokuchaev, 2 section of the institute Dokuchaeva 5 block Kamennaya Steppe, Talovskiy district, Voronezh region 397463, Russianiish1c@mail.ru Author's articles Economic and biological characteristics of the biotypical composition of spring wheat varieties