Different cultivars of oats were the treatments of the experiment. For each cultivar there were two controls: with and without irradiation. Before sowing both sides of seed flat stream were irradiated with light of 110130 W/m² density per each stream for waves of 650-670 nm length. Presowing seed irradiation significantly influenced oats grain yield and yield components. Under conditions of the experiment dependent on the cultivar grain yield increased by about 16.5-23.2%. The irradiation caused also higher field emergence ability and smaller losses of plants during vegetation period. Presowing seed biostimulation influenced the following yield components: productive tillering and weight of grain per plant. There was also significant interaction between cultivar and irradiation what in the case of qualities like productive tillering, grain weight per one plant shows different response of the cultivars to irradiation.