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\nThe work is devoted to research of CO2 emission dynamics on fallow lands of 5-10 years of age. The purpose was to study the amount of CO2 emission from gray forest soil at different technologies of fallow land introduction into agricultural turnover in the sub-boreal forest of Western Siberia. Technologies of fallow land introduction into turnover have a significant influence on CO2 emission. Spring wheat was cultivated on experimental plots under 2 technologies (methods) of fallow land introduction into turnover. In comparison with fallow land, CO2 emission increased by 1.35 times at agrotechnical technology (with pre-sowing tillage). At combined technology (direct sowing) - 1.18 times. The agrotechnical technology of fallow land restoration contributed to higher CO2 emission (than the combined technology), probably due to higher intensity of soil tillage during fallow land restoration with this technology and increased aeration and microbiological activity in the soil layer. On the basis of the data obtained on carbon dioxide emission from gray forest soils in the sub-boreal forest, models of soil CO2 emission depending on the applied technology of fallow land conversion were developed.\n