Abstract
A field experiment of a biological preparation based on the association of nitrogen-fixing bacteria was carried out. The composition includes active and compatible strains of nitrogen-fixing and nodule bacteria. As a result, the biological preparation had a positive effect on germination, length and vegetative mass of peas. The results of research indicate the perspective of the industrially valuable strains of this association. Optimal conditions for the work of the biological preparation are light mechanical composition of the soil and the provision of moisture during the growing season of plants. This preparation may be recommended for use in the Northern regions of Kazakhstan.