Estimation of environmental plasticity and stability of confectionary sunflower varieties
Studying of environmental plasticity and environmental stability is an important stage of an environmental trial. We conducted our researches in 2015-2018. The obtained results allow concluding the varieties have certain plasticity in weather and climatic conditions and response to improvement of cultivation conditions. Due to our investigation, the worse year for sunflower production was 2016, index of year condition was equal -6.58, the best one was 2017, with index equal to 9.66. The varieties Lakomka and Belochka had the highest stability for years (a coefficient of linear regression is 1.9). However, with worsening of the weather conditions during cultivation their productivity can reduce significantly. The varieties Dzhinn and Oreshek response not so active on the changes of the weather conditions of cultivation. This is affirmed with indicator of linear regression (bi) (0.1 and 0.4, respectively). The meaning of the standard error on yields of the varieties Dzhinn and Oreshek (6.14 and 4.76, respectively) characterize their high stability on this trait. This means even under changing cultivation conditions their technological qualities will be remained with minor variations. The digital indicators of quantitative traits of the variety SPK (an indicator of linear regression is the nearest to one and the standard error is equal to 14.13) in the different years of the research certifies the variety is quite plastic, but its stability is worse than the varieties Dzhinn and Oreshek have.