FIELD: biotechnology, agriculture. SUBSTANCE: invention relates to production of organic-mineral fertilizers. Bioaddition consists of two bacterium associations taken at the ratio = (1-2):(0.5-1). The first association has nitrogen-fixing bacterium Azotobacter chroococcum and Beijerinckia fluminensis taken at the ratio = (1-0.5) : (1-0.5). The second association has bacterium Bacillus megaterium and Bacillus mucilaginosus decomposing phosphorus- and potassium-containing compounds and taken at the ratio = (1-5): (0.5-2). Bioaddition has additionally polysaccharides as preserving agent and trace and macroelements also. Among nitrogen-fixing microorganisms addition has strains of Azotobacter chroococcum GSB-TB 4B and Beijerinckia fluminensis GSB-TB 5B and among microorganisms decomposing phosphorus- and potassium-containing compounds addition has strains of Bacillus megaterium GSB-TB 3B and Bacillus mucilaginosus GSB-TB 6B. EFFECT: improved quality and effectiveness of bioaddition. 16 cl, 4 ex
