Ecostern — a biological preparation containing cells of bacteria Bacillus subtilis, Azotobacter, Enterobacter, Enterococcus, and fungi Trichoderma lignorum, Trichoderma viride. The total number of viable cells is not less than 2.5 × 109 CFU/cm³. The preparation is intended for use in greenhouse vegetable crops and cereal crops. It may also be used for processing straw, including for retail sale to the public. The biological preparation improves soil fertility through the action of beneficial microorganisms.