State and Prospects for Fallow Lands of Kansk Forest-Steppe Involvement Into Agricultural Turnover

The purpose of the study is to assess the soil fertility of unused arable land in the Kansk forest-steppe of the Krasnoyarsk Region. The results of a soil-agrochemical survey of unused arable land in 9 districts of the Kansk forest-steppe of the Krasnoyarsk Region are presented. The studies were carried out by the Federal State Budgetary Institution "Station of Agrochemical Service "Solyanskaya" (FGBU "SAS "Solyanskaya") of the Rybinsk District in 2022–2023 within the framework of the state task of the Ministry of Agriculture to conduct surveys (soil, agrochemical and environmental-toxicological) of unused arable land for agricultural purposes. It has been established that the soil cover of unused arable land in the Kansk forest-steppe is dominated by chernozems and gray forest soils. Soils not used for arable land are characterized by medium and high humus content with a weighted average of 6.1 to 8.3 %. The soils are characterized by slightly acidic and close to neutral (5.1–6.3 pH units) environmental reaction. The exception is the sod-podzolic and sod-soil-gley soils of the Taseevo and Uyar Districts, where pHxl has a mode¬rately acidic reaction (4.6–4.9 pH units). Mobile phosphorus in soils is distributed extremely unevenly for soils of the same genetic origin in different administrative regions. The soils of unused arable land located in the northern and central parts of the region are much better provided with this element. Here, the weighted average content of available phosphorus is 211–319 mg/kg. In the southern subzone, the amount of available phosphorus in soils decreases, not exceeding 140 mg/kg. In terms of the content of exchangeable potassium, the fallow soils of the Kansk forest-steppe are provided with a medium to high level. The content of mobile sulfur in the surveyed soils is, as a rule, low and average (0.4–12.0 mg/kg). In the soils of unused arable land in the Aban and Irbey Districts, a high content of this element was noted (12.2–13.3 mg/kg).