| Summary: | Agricultural soils are a major source of greenhouse gases. Biochar is a soil improver and, when applied to the soil, sequesters carbon. However, a different combination of soil and climatic conditions and biochar leads to different research results. In this research, the effects of 1 kg/m<sup>2</sup> and 3 kg/m<sup>2</sup> biochar application to clay soils on the CO<sub>2</sub> flow in field experiments along two cropping seasons in the Russian Far East were investigated. Data showed that biochar significantly reduces the cumulative flow of soil CO<sub>2</sub>, compared with untreated field plots. In 2018, the greatest reduction in soil CO<sub>2</sub> emissions (28.2%) with 3 kg/m<sup>2</sup> of biochar was obtained, while in 2019, the greatest decrease in the cumulative CO<sub>2</sub> flow at the application dose of 1 kg/m<sup>2</sup> (57.7%) was recorded. A correlation between a decrease in the value of the cumulative CO<sub>2</sub> flux and an increase in the biomass grown in the studied areas of agricultural crops during the season of 2018 was found.
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