Bio-Inoculant-BTU is a biological preparation intended for use in agriculture. The preparation contains yeast Bradyrhizobium japonicum IMV B-7330 and Rhizobium leguminosarum IMV B-7331 at a concentration of 50 ± 20%. It is used for pre-sowing treatment of grain legume crops such as peas, beans, and soybeans. The preparation is applied once, at a rate of 1.0 to 4.0 kg per ton of seeds in industrial agriculture or 10.0 to 40.0 g per kg of seeds for private use. The preparation increases crop yield by stimulating plant growth and development. Bio-Inoculant-BTU is available in the form of a concentrate suspension or paste, ensuring ease of use during seed treatment. Bio-Inoculant-BTU is developed and manufactured by the enterprise PPK 'BTU-Center', located in the Vinnytsia region, the town of Ladihin. The preparation contains no chemical substances and is completely safe for the environment and human health. Application of Bio-Inoculant-BTU is recommended for agricultural enterprises of various forms of ownership, including the private sector. It is especially effective for growing cereal and legume crops, ensuring their better development and increased productivity. The preparation is easy to use and does not require complex application technologies.