The results of the analysis of available variety assortment and grain yields of different varieties of oats in the environmental crop variety testing, depending on the changing hydrothermal conditions are presented. Marked the varieties, which characterized by stable realization of genetic potential of grain yield in a wide range of variation the average air temperatures and conditions of water provision.Weather conditions during the investigation were different, which made it possible to fully assess its impact on grain productivity potential of spring small cereals. The productivity of oats was determined by the peculiarities of the variety, as well as the effectiveness of the complex action of air temperatures and humidity conditions. In Ukraine there is observing an annual steady increase in the number of registered varieties of oats for 12,9 %. In general, over the past 15 years, the number of oat varieties in Register of plant varieties suitable for dissemination in Ukraine has more than doubled. Among the studied varieties of oats, the optimum growth, development and combination of elements of the crop yield structure, which ensure the formation of the highest level of grain productivity (3,10-3,27 t/ha), were noted in the varieties of chaffy forms: Busol, Iren, Spurt and Sterno, as well as hull-less: Skarb Ukrainy (2,74 t/ha) and Samuel' (2,53 t/ha).
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