Estimation of adaptability parameters of winter common wheat samples at different sowing dates in the forest-steppe of Western Siberia

   There has been presented a three-year estimation of winter wheat samples according to adaptability indicators, the trait ‘productivity’, ‘winter resistance’, ‘1000-grain weight’, and ‘number of productive stems per m2’.   The purpose of the study was to estimate the adaptive potential of winter common wheat varieties in the forest-steppe of Western Siberia at different sowing dates.   The study was conducted in the laboratory for field crop breeding, seed production and cultivation technologies based on SibRIPCB, the branch of Institute of Cytology and Genetics, SB RAS (Novosibirsk region) in 2018–2022. The objects of study were 5 winter common wheat varieties developed by the SibRIPCB, a branch of the Institute of Cytology and Genetics SB RAS. Sowing was carried out in three periods (the first was in August 20, the second was in September 1 and the third was in September 10) with an SSFC-7 seeder in 5 repetitions, the recording plot area was 10 m², the placement of the plots was randomized, the crops were laid in weedfree fallow. As a result, there was established that, according to the trait ‘productivity’, the varieties ‘Novosibirskaya 2’ (bi = 1.42; δd² = 0.08) and ‘Novosibirskaya 3’ (bi = 1.35; δd² = 0.08) combined ecological adaptability and stability. The variety ‘Novosibirskaya 3’ also combined adaptability and stability according to the trait ‘number of productive stems per m2’ (bi = 1.09; δd² = 468.94). The winter variety ‘Krasnoobskaya’ is capable of consistently giving high yields ((Ymax+Ymin)/2 = 4.92; (Sc = 3.42); Hom = 26.2) and maintaining the density of productive stems ((Ymin–Ymax) = -280; Sc = 280.8; (Ymin+Ymax)/2 = 513; Hom = 8.9) at different sowing dates. The variety ‘Pamyati Chekurova’ is responsive to improvements in environmental conditions according to the trait ‘productivity’ (bi = 1.10; KM = 2.20), ‘winter resistance’ (bi = 1.53; KM = 2.72), ‘number of productive stems per m2’ (bi = 1.22; KM = 2.2).