This article submits results of a study of degraded grasslands improvement. During the study when herbage mixtures hadn’t been seeded, the first treatment of a sod layer of low-yeilding degraded grassland plots with disk tillers provided the increase of herbage up to 1.0 tons/ha and of hay up to 0.3 tons/ha. In comparison with the control sample direct seeding of herbage mixtures in the sod layer allows improvement of the yield of herbage from 1.3 up to 9.5 tons/ha and of hay from 0.9 to 2.4 tons/ha.The maximum yield increase has been obtained by seeding herbage mixtures after the first treatment of the sod layer: yield of herbage has increased from 3.5 up to 10.9 tons/ha and yield of hay – from 0.7 up to 2.8 tons/ha. In comparison with the control sample, the two-component legume-grass mixture of medic and awnless brome has given the maximum yield increase among the studied components of certain herbage mixtures.