Vegetation period of spring soft wheat varieties of different ripeness groups in agricultural zones of the Krasnoyarsk region

The purpose of the study is to analyze the effect of cultivation point and meteorological factors on the duration of the growing season of spring wheat varieties of different ripeness groups. We used data from the State Variety Commission of the Krasnoyarsk Region on the yield and duration of the growing season of spring soft wheat varieties for 1999-2020. Statistical data processing was performed for varieties of four ripeness groups: early ripening, mid-early, mid-ripening and mid-late, undergoing variety testing in 6 natural zones of the Krasnoyarsk Region at 10 state variety plots: Zone III (lowland subtaiga, Kazachinsky state cultivating plot), IV (foothill subtaiga, Dzerzhinsky, Sayansky) , V (Kansk-Krasnoyarsk forest-steppe, Sukhobuzimsky, Uyarsky), VI (forest-steppe of the Chulym District, Nazarovsky, Uzhursky), VII (southern forest-steppe, Karatuzsky), VIII (foothill steppe on ordinary and southern chernozems, Krasnoturansky, Minusinsky). A significant range of variability in the studied period between variety plots was revealed for mid-ripening varieties (22 days), early-ripening (20 days), mid-early (17 days), mid-ripening varieties (12 days). A shorter growing season for all ripeness groups is shown by varieties in the Kazachinsky variety plot, a longer one - in the Sayansky and Uyarsky variety plots. A significant amplitude of variability in the duration of the growing season for all ripeness groups is observed in the Nazarovsky, Karatuzsky, and in mid-ripening and mid-late varieties - Uyarsky, Uzhursky, Minusinsky variety plots. The phenotypic varia-bility of the period under study is determined primarily by the contribution of the factor “varietal plots” (34.0-48.1 %) and the interaction “years × varietal plots” (36.0-53.2 %). The variety plots are located in different natural and climatic zones of the region and have their own characteristics according to the complex of natural conditions, which is shown by different correlations between the duration of the growing season and meteorological factors. They differ in variety areas, which represent the natural zones of the region. It has been proven that to form the duration of the growing season of mid-late varieties at the Dzerzhinsky, Sayansky, Uyarsky and Nazarovsky variety plots, average daily air temperatures are more necessary; Sayansky, Dzerzhinsky, Sukhobuzimsky - precipitation; Sayan, Dzerzhinsky, Sukhobuzimsky, Uyarsky, Nazarovsky, Uzhursky variety plots - relative air humidity than for varieties of other ripeness groups. Reliable correlations between average daily air temperature, precipitation and relative air humidity with the duration of the growing season were obtained for all ripeness groups at the Karatuz and Krasnoturan variety plots.