INFLUENCE OF CLIMATE CHANGE ON THE PHENOTYPE VARIABILITY OF WINTER WHEAT VARIETIES IN THE CONDITIONS OF WESTERN FOREST-STEPPE OF UKRAINE
To confirm or refute the change in weather factors in the zone of the Western Forest-Steppe of Ukraine for the last (2006-2017) years and their influence on the autumn and spring transition of air temperature through 15, 10, 5 ° С; the onset of the first and last freezing on the soil surface, the duration of the frost period, the sum of active temperatures and the amount of rainfall in the seasons of the year of growing winter wheat. The high adaptability of genotypes to various changes in external factors contributed to the optimal growth and development of plants. Depending on the reaction of the variety to growing conditions in the Western Forest-Steppe zone, the difference between the forest-steppe and steppe ecotype was: in terms of sugar accumulation in tillering nodes - 0.7 %, wintering plants - 0.3 %, seed yield - 0.44 t/ha. The influence of weather factors on the yield of winter wheat seeds was estimated at 58%, varieties - 32%, the interaction of factors - 4%, others - 6%. The coefficient of variation of the forest-steppe and steppe ecotype varieties was weak (<10).