The paper presents the influence of bacterial inoculation of perennial legumes (alfalfa, bird’s-foot trefoil) in pure culture and cultivated in association with perennial gramineae on fodder yield, fodder quality, and atmospheric nitrogen-fixing ability. Results point out an increase of 10-12% of the yield of dry matter in the variants inoculated. Bacterial inoculation with specific bacterial stems (Sinorhizobium meliloti and Mezorhizobium loti) has a positive influence on fodder quality too, materialised in the raw protein content and the amount of nitrogen fixed biologically.