Modern state of irrigated soils at the south of the Volga upland

The goal is to assess the impact of 50-year irrigation by sprinkling on soil processes occurring in the light-chestnut soils (Luvic Kastanozem (Loamic, Aric, Protosodic, Bathysalic)) of the southern slopes of the Volga upland at the Volga-Don interfluve (FSUE “Oroshaemoe”, the Volgograd region) with deep ground water. Water for irrigation is supplied from the Varvarovsky reservoir of the Volga-Don Canal system. It is characterized by a total dissolved salts of about 1 g/l, a bicarbonate-chloride-sulfate compositionwith an increased sodium content. Detailed morphological description of soil profiles, granulometric composition, content of soluble salts in soils and sediments of the vadoze zone up to the depth of 3.5 m, dynamics of salts in the layer of 0-50 cm for 2011-2019 are presented. Until the autumn of 2015, the studied soils were deep saline, being no saline in the layer of 0-100 cm. In recent years, a weak salinity degree of soda-chloride sodium chemistry has been observed in the 0-50 cm layer as a result of gradual accumulation of irrigation water salts during irrigation organized according to water consumption of agricultural crops. Irrigated soils have acquired a complex of signs of secondary salinity: (1) the presence of light accumulations of sandy and silt mineral grains in the arable horizon, resulting from the destructive effect of irrigation water drops during sprinkling; (2) toxic alkalinity associated with sodium (residual sodium carbonate), according to water extraction 1 : 5 (soil : water), in the horizons from the depth of 10-20 to 60100 cm; (3) abundant humus-clay cutans on the lateral side faces of prismatic structural units in the undisturbed part of the soil profile from 30 to 100 cm.

1. Afanas'eva E.A., Chernozemy Sredne-Russkoj vozvyshennosti (Chernozems of the Central Russian Upland), Moscow, Nauka, 1966, 224 p.

2. Baranovskaya V.A., Azovcev V.I., CaCO3 i ego migraciya v oroshaemyh pochvah Zavolzh'ya (СаСО3 and its migration in irrigated soils of the TransVolga region), Sovershenstvovanie metodov ocenki zasolennyh pochv, prognozirovanie i preduprezhdenie vtorichnogo zasoleniya, Tezisy vsesoyuznogo soveshchaniya (Improvement of methods for assessing saline soils, forecasting and preventing secondary salinization, Theses of the AllUnion Meeting.), Moscow: Minsel'hoz, 1972, pp. 75-76.

3. Bezdnina S.Ya., Kachestvo vody dlya orosheniya: Principy i metody ocenki (Irrigation water quality: Principles and methods of assessment), Moscow: ROMA, 1997, 185 p.

4. Bolotin D.A., Dubenok N.N., Bolotin A.G., Fomin S.D., Tihonova M.K., Vodnye resursy Volgogradskoj oblasti i problemy ih ispol'zovaniya (Water resources of the Volgograd region and problems of their use), Izvestiya Nizhnevolzhskogo agrouniversitetskogo kompleksa: nauka i vyssheeprofessional’noe obrazovanie, 2018, No. 4 (52), pp. 191-197. DOI: 10.32786/2071-9485-2018-04-27.

5. Vadyunina A.F., Korchagina Z.A., Metody issledovaniya fizicheskih svojstv pochv (Methods for studying the physical properties of soils), Moscow: Agropromizdat, 1986, 416 p.

6. Veklich M.F., Stratigrafiya lyossovoj formacii Ukrainy i sosednih stran (Stratigraphy of the loess formation in Ukraine and neighboring countries), Kiev: “Naukova Dumka”, 1968, 238 р.

7. Velichko A.A., Gribchenko Yu.N., Gubonina Z.P., Drenova A.N., Zelikson E.M., Markova A.K., Morozova T.D., Nochaev V.P., Oreshkin D.B., Pevzner M.A., Svetlickaya T.V., Sycheva S.A., Timireva S.N., Udarcev V.P., Faustova M.A., Halcheva T.A., Cackin A.I., Cheplyga A.L., Chikolini N.I., Lyossovo-pochvennaya formaciya Vostochno-Evropejskoj ravniny. Paleogeografiya i stratigrafiya (Loess-soil formation of the East European Plain. Paleogeography and stratigraphy), Moscow: Institut geografii RAN, 1997, 144 p.

8. GOST 17.1.2.03-90. Protection of Nature. Hydrosphere. Criteria and indicators of water quality for irrigation, Moscow: IPK Izdatel'stvo standartov, 2012, 8 p.

9. Gorokhova I.N., Khitrov N.B., Prokopeva K.O., Kharlanov V.A., Soil Cover of the Svetloyarsk Irrigation System after 50 Years of Reclamation Practices, Eurasian Soil Science, 2018, Vol. 51, No. 8, pp. 1-11,. DOI: 10.1134/S1064229318060078.

10. Gorokhova I.N., Avdeeva T.N., Pankova E.I., Prokopyeva K.O., Soil and Agrochemical Characteristics of the Svetloyar Irrigated Site in Volgograd Oblast, Arid Ecosystems, 2019, Vol. 9, No. 1, pp. 41-50, DOI: 10.1134/S2079096119010074.

11. State (National) report on the state and use of land in the Russian Federation in 2018, Ministry of Economic Development of the Russian Federation, Federal Service for State Registration and Cartography, Moscow, 2019, 196 р.

12. Degtyareva E.T., Zhulidova A.N., Pochvy Volgogradskoj oblasti (Soils of the Volgograd region), Volgograd: Nizhne-Volzhskoe knizhnoe izd., 1970, 319 р.

13. Dedova E.B., Zonal'naya shkala ocenki kachestva polivnyh vod respublika Kalmykiya (Zonal scale for assessing the quality of irrigation water in the Republic of Kalmykia), Sinergiya, 2018, No 1, рр. 88-95, URL: https://vepi.ru/wp-content/uploads/2018/10/Sinergiya-2018-1.pdf.

14. Doskach A. G. Prirodnoe rajonirovanie Prikaspijskoj polupustyni (Natural zoning of the Caspian semi-desert), Moscow: Nauka, 1979, 142 р.

15. Dronova T.N., Burceva N.I., Molokanceva E.I., Nauchnye rezul'taty issledovanij po mnogoletnim travam (Scientific results of research on perennial herbs), Izvestiya Nizhnevolzhskogo agrouniversitetskogo kompleksa: nauka i vysshee professional’noe obrazovanie, 2017, No. 3 (47), рр. 46-56.

16. Dubenok N.N., Bolotin D.A., Novikov A.A., Bolotin A.G., Effektivnost' ispol'zovaniya vodnyh resursov v oroshaemom zemledelii (Efficiency of use of water resources in irrigated agriculture), Izvestiya Nizhnevolzhskogo agrouniversitetskogo kompleksa: nauka i vysshee professional’noe obrazovanie, 2018, No. 3 (51), рр. 83-90.

17. Zimovec B.A., Ekologiya i melioraciya pochv suhostepnoj zony (Ecology and land reclamation of the dry steppe zone), Moscow: Pochvennyj institut im. V.V. Dokuchaeva, 1991, 248 р.

18. Zimovec B.A., Khitrov N.B., Ekologicheskaya ocenka prigodnosti vody dlya orosheniya pochv (Ecological assessment of the suitability of water for soil irrigation), Doklady Rossijskoj akademii s.-kh. nauk, 1993, No. 4, рр. 4148.

19. Ivanov V.M., Danilenko Yu.P., Zernovoe sorgo i kukuruza pri oroshenii v Nizhnem Povolzh’e (Grain sorghum and corn under irrigation in the Lower Volga region), Volgograd: IPK FGOU VPO VGSKHA “Niva”, 2010, 240 р.

20. Kadaeva A.G., K voprosu o kachestve orositel'nyh vod v Kalmykii (On the issue of the quality of irrigation water in Kalmykia), Vestnik Kalmyckogo instituta gumanitarnyh issledovanij RAN, 2013, No. 1, рр. 160-162.

21. Kirpo N.I., Vodnyi, solevoi rezhim oroshaemykh pochv, zabolachivanie i vtorichnoe ikh zasolenie v usloviyakh Nizhnego Povolzh’ya. Priemy ikh melioratsii. Volgograd: FGBOU VO Volgogradskii GAU, 2015. 320 vtorichnoe ih zasolenie v usloviyah Nizhnego Povolzh’ya. Priemy ih melioracii (Water, salt regime of irrigated soils, waterlogging and their secondary salinization in the conditions of the Lower Volga region. Techniques for their reclamation), Volgograd: FGBOU VO Volgogradskij GAU, 2015, 320 р.

22. Klassifikatsiya i diagnostika pochv Rossii (Classification and diagnostics of soils in Russia), Smolensk: Oykumena, 2004, 342 p.

23. Klassifikaciya i diagnostika pochv SSSR (Classification and diagnostics of soils in the USSR), Moscow: Kolos, 1977, 223 р.

24. Kornblyum E.A., Pochva kak ierarhicheskaya sistema morfologicheskih elementov (Soil as a hierarchical system of morphological elements), Pochvovedenie, 1975, No. 9, рр. 36-48.

25. Kravchenko E.I., Khitrov N.B., Gorokhova I.N., Two-dimensional distribution of salinity in irrigated soils near the irrigation channel at the plot “Chervlenoe” of the Svetloyar irrigation system, Dokuchaev Soil Bulletin, 2018, Vol. 94, pp. 19-38, DOI: 10.19047/0136-1694-2018-94-19-37.

26. Kruzhilin I.P., Bolotin A.G., Bekmametov A.A., Plodorodie svetlo-kashtanovyh pochv pri vodosberegayushchem oroshenii (Fertility of light chestnut soils with water-saving irrigation), Plodorodie, 2009, No. 6 (51), рр. 34-35.

27. Kruzhilin I.P., Ganiev M.A., Melihov V.V., Bolotin A.G., Rodin K.A., Rezhim orosheniya i dozy vneseniya udobrenij na posevah risa s periodicheskimi polivami v Nizhnem Povolzh'e (Irrigation regime and doses of fertilizers on rice crops with periodic irrigation in the Lower Volga region), Doklady Rossijskoj Akademii Sel'skohozyajstvennyh Nauk, 2015, No. 5, рр. 43-46.

28. Kruzhilin I.P., Kazakova L.A., Kompleksnaya melioraciya soloncov na oroshaemyh zemlyah Volgo-Donskogo mezhdurech'ya (Complex reclamation of solonetzes on irrigated lands of the Volga-Don interfluve), Pochvovedenie, 2003, No. 5, рр. 623-629.

29. Kruzhilin I.P., Morozova A.S., Kazakova L.A., Dinamika pochvennyh processov v soloncah pri oroshenii (Dynamics of soil processes in solonetzes during irrigation), Pochvovedenie, 1991, No. 10, рр. 100-111.

30. Popov I.V., Bykov V.S. (Eds), Lyossovye porody SSSR (Loess breeds of the USSR), Moscow: “Nauka”, 1966, 256 р.

31. Lyubimova I.N., Novikova A.F., Changes in the Properties of Solonetzic Soil Complexes in the Dry Steppe Zone under Anthropogenic Impacts, Eurasian Soil Science, 2016, Vol. 49, No. 5, pp. 581-590, DOI: 10.1134/S1064229316050112.

32. Melihov V.V., Danilenko YU.P., Bolotin A.G., Programmirovannoe vozdelyvanie kukuruzy na oroshaemyh zemlyah Nizhnego Povolzh'ya (Programmed corn cultivation on irrigated lands in the Lower Volga region), Zemledelie, 2011, No. 2, рр. 9-11.

33. Gerasimova M.I., Krasilnikov P.V. (Eds), World abstract database of soil resources 2014. International system of soil classification for diagnostics and creation of soil map legends. Revised and updated version 2015. Reports on world soil resources 106. FAO, Moscow: MGU im. M.V. Lomonosova, 201, 203 р.

34. Novikova A.F., Morozova A.S., Salt-Affected Soils of Volgograd Oblast, Eurasian Soil Science, 2003, Vol. 36, No. 9, pp. 936-958.

35. Pankova E.I., Novikova A.F., Ameliorative Status and Secondary Salinization of Irrigated Soils in Volgo-grad Oblast, Eurasian Soil Science, 2004, Vol. 37, No. 6, pp. 634-645.

36. Polevoj opredelitel pochv Rossii (Field guide to Russian soils.), Moscow: Pochvennyj institut im. V.V. Dokuchaeva, 2008, 182 р. 37. Tikhonova M.K., Monitoring vodnyh nagruzok v oroshaemyh agrolandshaftah (Monitoring of water loads in irrigated agricultural landscapes), Oroshaemoe zemledelie, 2014, No. 4, рр. 9-10.

37. Khitrov N.B., Gorokhova I.N., Kravchenko E.I., Combination of saline soils of the Northern slope of the Ergeni upland after irrigation cessation, Dokuchaev Soil Bulletin, 2019, Vol. 97, pp. 52-90, DOI: 10.19047/01361694-2019-97-52-90.

38. Ahmed M., Hussain N., Al-Rawahy S.A., Management of Saline Lands in Oman: Learning to Live with Salinity, Developments in Soil Salinity Assessment and Reclamation: Innovative Thinking and Use of Marginal Soil and Water Resources in Irrigated Agriculture, 2013, pp. 265-281, DOI: 10.1007/978-94-007-5684-7 17.

39. Dagar J.C., Minhas P.S., Agroforestry for the Management of Waterlogged Saline Soils and Poor-quality Waters, Advances in Agroforestry, 2016, 210 p., DOI: 10.1007/978-81-322-2659-8.

40. de Soto IS., Virto I., Barre P., Fernandez-Ugalde O., Anton R., Martinez I., Chaduteau C., Enrique A., Bescansa P., A model for field-based evidences of the impact of irrigation on carbonates in the tilled layer of semiarid Mediterranean soils, Geoderma, 2017, Vol. 297, рр. 48-60, DOI: 10.1016/j.geoderma.2017.03.005.

41. Fourati H.-t., Bouaziz S., Benzina M., Bouaziz M. Detection of terrain indices related to soil salinity and mapping salt-affected soils using remote sensing and geostatistical techniques, Environmental Monitoring and Assessment, 2017, 189:177, DOI: 10.1007/S10661-017-5877-7.

42. IUSS Working Group WRB. 2015. World Reference Base for Soil Resources 2014, update 2015. International soil classification system for naming soils and creating legends for soil maps, World Soil Resources Reports, FAO, Rome, No. 106, 192 p.

43. Kumar M., Etesami H., Kumar V., (Eds), Saline Soilbased Agriculture by Halotolerant Microorganisms, 2019, 253 p. DOI: 10.1007/978-981-13-83359.

44. Moharana P.C., Singh R.S., Singh S.K., Tailor B.L., Jena R.K., Meena M.D., Development of secondary salinity and salt migration in the irrigated landscape of hot arid India, Environmental Earth Sciences, 2019, Vol. 78:454, pp. 1-11, DOI: 10.1007/s12665-019-8460-4.

45. Murtaza G., Ghafoor A., Zia-ur-Rehman M., Qadir M., Chapter 19. Marginal-Quality Water Use as an Ameliorant for Tile-Drained Saline-Sodic Soils in a Rice-Wheat Production System, Developments in Soil Salinity Assessment and Reclamation: Innovative Thinking and Use of Marginal Soil and Water Resources in Irrigated Agriculture, 2013, pp. 295-311, DOI: 10.1007/978-94-007-5684-719.

46. Suarez D.L., Use of Marginal-Quality Waters for Sustainable Crop Production, Developments in Soil Salinity Assessment and Reclamation: Innovative Thinking and Use of Marginal Soil and Water Resources in Irrigated Agriculture, 2013, pp. 367-381, DOI: 10.1007/978-94-007-5684725.

47. Swarup A., Sustainable Management of Salt-Affected Soils and PoorQuality Ground Waters for Enhancing Crop Production, Developments in Soil Salinity Assessment and Reclamation: Innovative Thinking and Use of Marginal Soil and Water Resources in Irrigated Agriculture, 2013, pp. 327334, DOI: 10.1007/978-94-007-5684-721.

48. Wu L.S., Wood Y., Jiang P.P., Li L., Pan G., Lu L.Q., Pan G.X., Lu J.H., Chang A.C., Enloe H.A., Carbon sequestration and dynamics of two irrigated agricultural soils in California, Soil Science Society of America Journal, 2008, Vol. 72, pp. 808-814, DOI: 10.2136/sssaj2007.0074.

49. Yahiajui I., Douaoui A., Zhang Q., Ziane A., Soil salinity prediction in the Lower Cheliff plain (Algeria) based on remote sensing and topographic feature analysis, Arid Land, 2015, Vol. 7 (6), pp. 794-805, DOI: 10.1007/s40333-015-0053-9.

50. Zaman M., Shahid S.A., Heng L., Guideline for Salinity Assessment, Mitigation and Adaptation Using Nuclear and Related Techniques. International Atomic Energy Agency, 2018, 164 p., DOI: 10.1007/978-3-31996190-3.

51. Zhang J., Coastal Saline Soil Rehabilitation and Utilization Based on Forestry Approaches in China, 2014, 182 p., DOI: 10.1007/978-3-642-399152.