Study of acid-alkaline conditions of different-age arable soils of landscape catens of Central Forest-Steppe

Fertility of soils is largely determined by their physical and chemical properties. Response of soil environment is a mobile indicator of soil fertility. Direction and intensity of almost all soil processes that provide nitrogen, phosphorus and potassi- um regimes of soils, as well as availability of macro- and microelements for plants, depend on it. The paper presents the result of a field study of acid-alkaline conditions of profiles of black soil of typical and leached different terms of agricultural use of soil cat- ens of the meadow-steppe section of the Belgorod region in 2019. The research object was different-age arable areas with an age of agricultural development of 140 and 240 years, respectively. The steepness of surface in areas corresponding to the meadow-steppe zonal landscape of the forest-steppe did not exceed 4-6 °. As a result of field studies, 32 incisions were studied in the mead- ow-steppe section (6 incisions on background catens and 12 incisions on open catens). Each incision was provided with layered values of morphometric indicators of soil horizons. For background steppe soils, shade slopes are characterized by more alkaline conditions, in comparison with southern slopes. For 140-year-old arable land, the situation is opposite: shadow slopes have a more acidic reaction of the medium, in comparison with insoluble ones; for 240-year-old arable land, alkaline-acid conditions on the slopes of opposite expositions did not differ significantly. In the first 140 years of plowing, acidification of the soil profile occurs; the difference in the pH value between the background and arable land values of 140 years of age on the slope of the northern ex- position reaches 1.6 on the surface, gradually decreasing to 0.2 at depth. Further plowing leads to alkalization of the soil profile by 0.6-0.9 pH units. The research results can be used in development of agricultural systems in crop industries.

1. Mordkovich V.G. Steppe ecosystems. 2nd ed. Novosibirsk, Geo Publ., 2014. 170 p. (in Russian).

2. Karavaeva N.A. Agrogenic soils: environmental conditions, properties, and processes. Pochvovedenie = Eurasian Soil Science, 2005, no. 12, pp. 1518-1529 (in Russian)

3. Ramenskii L.G. Introduction to a comprehensive soil and geobotanical land survey. Moscow, Sel’khozgiz Publ., 1938. 620 p. (in Russian).

4. Milne G. A provisional soil map of East Africa (Kenya, Uganda, Tanganyika, and Zanzibar), with explanatory memoir. London, Crown Agents for the Colonies, 1936. 34 p.

5. Polynov B. Weathering. Composition of continental deposits. Proceedings of the Geological Association. Iss. 4. Moscow, Publishing House of the USSR Academy of Sciences, 1935. 27 p. (in Russian).

6. Lisetskii F.N. The spatial and temporal organization of agrolandscapes. Belgorod, Publishing House of the Belgorod State University, 2000. 304 p. (in Russian).

7. Chendev Yu. G. Evolution of the forest-steppe soils of the Central Russian Upland in the Holocene. Moscow, GEOS Publ., 2008. 212 p. (in Russian).

8. Chendev Yu. G., Gennadiev A. N., Zhidkin A. P., Koshovskii T. S., Vagurin I. Yu. Distribution of organic matter in soils of catens of forest-steppe of different terms of agricultural development. Problemy prirodopol’zovaniya i ekologicheskaya situatsiya v Evropeiskoi Rossii i sopredel’nykh territoriyakh: materialy VII mezhdunarodnoi nauchnoi konferentsii (pamyati professora A.N. Petina), Belgorod, 24–26 oktyabrya 2017 g. [Problems of nature management and the ecological situation in European Russia and adjacent countries: proceedings of the VII international scientific conference (in memory of professor A. Petin), Belgorod, October 24– 26, 2017]. Belgorod, 2017, pp. 274-280 (in Russian).

9. Kashtanov A. N., Zaslavskii M.N. Soil and water protecting farming. Moscow, Rossel’khozizdat Publ., 1984. 462 p. (in Russian).

10. Kiryushin V.I. Agronomic soil science. Moscow, KolosS Publ., 2010. 687 p. (in Russian).

11. Lukin S.V. Dynamics of the main agrochemical parameters of soil fertility in the Central Chernozemic regions of Russia. Agrokhimiya [Agrochemistry], 2011, no. 6, pp. 11-18 (in Russian).

12. Chekmarev P.A. Agrochemical state of arable soils in central black soil region of Russia. Dostizheniya nauki i tekhniki APK = Achievements of Science and Technology of AIC, 2015, vol. 29, no. 9, pp. 17-20 (in Russian).

13. Chekmarev P. A., Lukin S. V., Siskevich Yu. I., Yumashev N. P., Korchagin V. I., Khizhnyakov A.N. Monitoring of the acidity of arable soils in central black earth region. Dostizheniya nauki i tekhniki APK = Achievements of Science and Technology of AIC, 2011, no. 7, pp. 6-8 (in Russian).

14. Chekmarev P. A., Lukin S.V. Dynamics of fertility of arable soils, use fertilizers and yielding of main agricultural crops in Central Black earth regions of Russia. Mezhdunarodnyi sel’skokhozyaistvennyi zhurnal = International Agricultural Journal, 2017, no. 4, pp. 41-44 (in Russian).

15. Alyabina I. O., Nedanchuk I.M. Assessment of the relationships between the distribution of soil horizons and the climatic parameters. Eurasian Soil Science, 2014, vol. 47, no. 10, pp. 968-979. https://doi.org/10.1134/S1064229314080018

16. Urusevskaya I. S., Alyabina I. O., Shoba S.A. Soil-geographical zoning as a direction of science and as the basis for rational land use. Eurasian Soil Science, 2015, vol. 48, no. 9, pp. 897-910. https://doi.org/10.1134/S1064229315090112

17. Khomyakov D.N. Changes in the acidity of the natural environment and liming of soils in regions with a humid climate. Agrokhimiya [Agrochemistry], 2000, no. 3, pp. 81-91 (in Russian).

18. Chendev Yu. G., Lupo E. R., Lebedeva M. G., Borbukova D.A. Regional specificity of the climatic evolution of soils in the southern part of Eastern Europe in the second half of the Holocene. Eurasian Soil Science, 2015, vol. 48, no. 12, pp. 1279-1291. https://doi.org/10.1134/S1064229315120042

19. Smirnova L. G., Kukharuk N. S., Chendev Yu. G. Soil cover in the southern forest-steppe of the central russian upland against the background of centennial climate fluctuations. Eurasian Soil Science, 2016, vol. 49, no. 7, pp. 721-729. https://doi.org/10.1134/S1064229316070103