The study is based on the agro-ecological assessment of the main soils of the forest zone in Omsk region. Agro-ecological regions and categories of natural and economic assessment of soils are distinguished: from very low (less than 25) to low (up to 75) score. The agro-ecological assessment of the most common soils of the forest zone enabled ranking the soils in descending order by scores and by the natural resource potential: dark gray forest – soddy-podzolic - podzol – floodplain – meadow-boggy – boggy soils. The main arable soils of the forest zone are sod-podzolic and gray forest soils. The agro-ecological assessment score of sod-podzolic soils vary from 19 to 54 depending on the natural economic zone, and gray forest soil scores vary from 40 to 73.

The study is based on the results of agro-ecological assessment of the main arable soils of the forest-steppe and steppe zones in Omsk region. Agro-ecological regions and categories of natural and economic score of lands are determined: from medium (50–75) to very high (more than 175) score, with focus on Irtysh as a region with a lowered score. The agro-ecological assessment of the main arable soils of the forest-steppe and steppe zones enabled ranking the soils in descending order by scores and by favorable natural conditions of the zone: leached chernozems – ordinary chernozems – carbonate chernozems – podzolized chernozems – brackish chernozems – meadow-black-chernozems and gray forest solodized – deep and medium saline soil. The main arable soils of the forest-steppe and steppe zones are ordinary chernozems, southern chernozems, and meadow chernozems. The agro-ecological score of ordinary chernozems varies from 69 to 196 depending on the natural economic zone, southern chernozems – from 62 to 146, and meadow chernozems – from 52 to 146.

The paper reflects the results of studying the temporal variability of carbon dioxide fluxes by the soils of deposits when they are introduced into agricultural circulation. The purpose of the research is to study the change in carbon dioxide emissions by the soils of fallow lands in the conditions of the steppe of Western Siberia. In 2022, research was conducted in the Omsk Region at key sites. The soils of the site are solodic, malodorous medium low-sodium columnar heavy loamy meadow-chernozem; cortical columnar heavy loamy saline meadow-chernozem, fine-grained low-humus heavy loamy meadow malt. Seasonal changes in carbon dioxide fluxes by soils on deposits when introduced into circulation using agrotechnical technology are significant (Figure 2) with a maximum in July (67.7 g CO2/m2/day) and a minimum in September (16.7 g CO2/m2/day); on deposits with combined technology, respectively, 54.4 and 14.1 g CO2/m2/day. Agrotechnical technology contributed to a greater emission of carbon dioxide from the soils of the deposit than combined. The system of agrotechnical techniques when introducing fallow soils into agricultural circulation has a significant impact on the release of carbon dioxide by the soil surface. Of the soil level of the deposit without treatment, it was 162% with agrotechnical technology (tillage), and with combined (tillage + herbicide application) 133%.

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