The Signum preparation is a biopreparation containing strains of bulbous bacteria Bradyrhizobium japonicum Semia 5079 and Semia 5080. Each 1 ml of the preparation contains not less than 1 billion viable bacterial cells, as well as the protector Premax. The preparation is used for treating soybean crops. For application, mix 150 ml of Signum with 45 ml of the protector Premax in 200 ml of water to treat 50 kg of soybean seeds once. The preparation is produced by the company 'Rizobacter Argentina' (Rizobacter Argentina S.A.), located in Pergamino, Buenos Aires, Argentina. The product is intended for use in agriculture and helps improve plant growth through nitrogen fixation by bacteria.