The current humus state of the fallow lands of the Akmola region in the subzone of the southern chernozems

   The research studied the humus state and humus reserves in a layer of 0-20 cm for 3 types of deposits in the steppe zone of the Akmola region on southern chernozems, on which agricultural use was discontinued in different periods of time. An assessment of the postagrogenic recovery of humus content in deposits of different ages is given. It was determined that the content and reserves of humus in layers 0-10 and 10-20 cm differ significantly depending on the age of fallow lands. Also, a change in soil density in a 20-centimeter soil layer was found with an increase in the age of the deposit. This indicates the processes of natural reproduction of humus of southern chernozems in the region during post-agrogenic land restoration, using the example of a deposit. The increase in the age of the deposit was accompanied by an increase in humus content and soil density. The results obtained allowed to determine the prospects for their further use in agriculture.

1. Kazanovsky S.G., Dorofeev N.V., Zorina S.Yu., Sokolova L.G. Vegetation of fallows of different ages in the forest-steppe zone of Pre-Baikal// Problems of Botany of Southern Siberia and Mongolia. - 2022. - Vol. 21, - № 2. - Р. 54-58.

2. Zorina S.Yu., Sokolova L.G., Dorofeev N.V., Kazanovsky S.G. Humus condition of different-aged fallows in the forest-steppe zone of Pre-Baika l// Bulletin of IRGSA. - 2020. - № 96. - Р. 16-24.

3. Karelin D.V. Changes in carbon stocks and CO₂ emissions during post-agrogenic vegetation succession on gray forest soils in the European part of Russia // Soil Science, 2017. - № 5. - Р. 580-594.

4. Kozlova A.A. Indicators of the humus condition of soils in Southern Pribaikalye, found in virgin, arable, and fallow regimes// Sci. Med. Bulletin. - 2016. - № 1 (3). - Р. 106-118.

5. Shpedt A.A. Humus condition and rational use of fallow soils of Priyenisey Siberia // Achievements of Science and Technology of the Agro-Industrial Complex. - 2017. - Vol. 31, - № 5. - Р. 5-8.

6. Summary analytical report on the condition and use of land in the Republic of Kazakhstan for 2023. Astana, 2023, 336 p.

7. Galaktionova L.V., Vasilchenko A.V., Anufrienko A.A., Terekhova N.A. Restoration of the Humus State of Steppe Chernozems in Fallow Conditions // Bulletin of Orenburg State University. - 2017. - № 9 (209). - P. 3–7.

8. Shpedt A.A., Vergeychik P.V. Assessment of the Rate of Humus State Restoration soils in Fallow Conditions in the Krasnoyarsk Region // Bulletin of Altai State Agricultural University. - 2014. - № 6 (116). - P. 48-52.

9. Agroclimatic Resources of the Akmola Region: Scientific and Applied Handbook / Edited by S.S. Baysholanov. Astana, 2017. 133 p.

10. Lurie D.I., Goryachkin S.V., et al. Dynamics of agricultural lands in Russia in the 20sup>th</sup> century and post-agrogenic recovery of vegetation and soils. M.: GEOS, 2010. 416 p.

11. Filatova T.D. Restorative dynamics of East European meadow steppes // Doctoral dissertation in biological sciences. Moscow, 2005. 212 p.

12. Kalinina O. Self-restoration of post-agrogenic chernozems of Russia: Soil development, carbon stocks, and dynamics of carbon pools// Geoderma, - 2011. - Vol. 162. - Р. 196-206.

13. Terpelets V.I., Slyusarev V.N. Educational and methodological guide on the study of agrophysical and agrochemical methods of soil research. Krasnodar: KubSAU, 2010. 65 p.

14. Lopez de Guerenu V.O., Kurganova I.N., Ermolayev A.M., Kuzakov Y.V. Changes in organic carbon pools during self-restoration of arable chernozems // Agrochemistry, - 2009. - № 5. - Р. 5-12.

15. Kurishbayev A.K., Chernenok V.G., Zvyagin G.A. Anthropogenic changes in dark-chestnut soils of Northern Kazakhstan and measures for their improvement // International Electronic Journal of Mathematics Education, 2016. - Vol. 11. - № 6. - Р. 1577-1590.

16. Vasilchenko N.I., Zvyagin G.A. Changes in physical properties of southern carbonate chernozems under various tillage systems in Northern Kazakhstan // Samara Scientific Bulletin. - 2016. - № 4 (17)7 - Р. 10-13.