The study was dedicated to the impact of bacterial biopreparations Nitrogen-bacterin, Phospho-bacterin and Silicon-bacterin on physiological parameters of plants wt the initial stage of growth. Biopreparations enhanced energy of seeds germination, seedlings growth speed, stimulated root formation, which facilitated better nutrition, growth and development of plants. The study justifies efficiency of associative interactions of biopreparations agrobacteria
with plants based on functional activity of peroxidase – one of stress enzymes. Reduction of peroxidase activity in the seedlings under the impact of biopreparations apparently proves positive response of plant to associative bacteria and may serve as a marker response to external influences.