Estimation of environmental plasticity and stability of spring rapeseed varieties and hybrids

We conducted an ecological variety testing of varieties and hybrids of spring rapeseed in 2016-2019 in the Omsk region evironments. Varieties and hybrids were compared depending on their ecological plasticity and stability. The results of calculations showed that the best environmental conditions were in 2017 (I j= +4.68) and in 2016 (Ij = +2.08). The worst year for growing rapeseed varieties and hybrids was 2019 (Ij = -7.32). The varieties Granit, Yubileyny and 55th region were the most responsive to changes in environmental conditions: 1.17, 1.14 and 1.11, respective. The coefficient of linear regression bi was higher than 1. The varieties Sirius, Highlight, and Flagman react less strongly to changes in environmental conditions: 0.72, 0.79 and 0.88, respectively. The complete compliance of changes in the variety yield with the changes in environments we observed in the varieties Tavrion, Ruyan and Hunter (bi = 1.0-1.03), i.e. these varieties responded adequately to changes in cultivation conditions. The results of the standard deviation in yield of Hunter, Kupol and Ruyan varieties (0.09-0.13) characterize these varieties as highly stable in this indicator, i.e. if the cultivation conditions deteriorate, their technological properties will be preserved. The varieties Antares, Highlight and a hybrid Salsa on the results of the research belong to the less stable and significantly react to the changes of cultivation conditions.