Planting of Dactylis glomerata cv. Minora for seeds on light soil with a companion crop of spring barley, seed yield was obtained, on average, 6.86 dt ha–1 in the first year of harvest (2011) and 4.99 dt ha–1 in the second year of harvest (2012). The results, presenting the changes of plant density in the years of seeds harvest, the biometric features of plants (number of generative shoots, inflorescence length, number of spikelets and seeds per inflorescence) as well as yield of seeds and straw, indicated a positive effect of mineral fertilization and the most favorable dose was: 120 kg N, 80 kg P and 180 kg K per hectare.