Black oats seeds (Avena strigosa Schreb.) of Embrapa 29 and Embrapa 140 cultivars, with three vigor levels (100, 85 and 75% of germination) obtained by artificial ageing by hyidrotermotherapy, were growing on two nitrogen fertilization levels (0kg.ha-1 and 52.5kg.ha-1), with the objective to evaluate possible interactions among nitrogen fertilization and seed vigor. Differents seed vigor levels did not affect seed yield, yield components, plant heigth, harvest index and physiological quality of the produced seeds. Embrapa 29 cultivar seeds with reduced vigor, when under nitrogen fertilization, caused reduction in the biological yield, in the leaf area index and in nitrogen accumulation at anthesis. Nitrogen fertilization increased seed yield, produced reduction on physiological seed quality and smaller allocation efficiency of the biological yield to the seeds. Nitrogen concentration and accumulation on vegetative tissue and seeds, nitrogen remobilization to the seeds and nitrogen utilization efficiency were not affected by growing seeds with different vigor levels. Nitrogen fertilization increased the nitrogen accumulation on vegetative tissue and seeds, and the nitrogen remobilization to seeds, whereas nitrogen translocation efficiency and nitrogen utilization efficiency, as well as its concentration in vegetative plant tissue were not affected by nitrogen level. Nitrogen concentration in the seeds increased with the nitrogen fertilization.