Abstract <p>The presented results of the study of post-reclamation formation of chestnut solonetz associations of the former Malouzenskii solonetz station are based on the morphological status of soils according to modern and previously published data. Virgin meadow-steppe chestnut solonchakous solonetzes were reclaimed in 1935–1940 by deep plowing, application of chemical ameliorants, and irrigation. Georeferencing of published soil maps and irrigation system diagrams with plots made it possible to assess the previous status of soils in terrain conditions based on available published information with an error of no more than 15 m. The majority of the studied soils of the experimental station were represented in 2025 by carbonate-accumulative solonetzic deep gypsum-containing agrozems with an agrohumus horizon from 30 to 48 cm thick, which consisted of 4–5 subhorizons. Within a 90-year-long period of formation, no morphological features of the solonetzic profile restoration were found in the areas of the original solonetzes. Annual mixing of a 20–30-cm-thick layer by moldboard plowing and irrigation with water of acceptable quality after physical destruction of the solonetz horizon by trench plowing ensured the use of reclaimed soil in grain-forage crop rotations for 70 years. The fallow regime during the past 18 years favored differentiation of the reclaimed layer: the platy structure of the surface horizon was restored, sod appeared in places, and leaching of carbonates incorporated into the reclaimed layer during deep plowing was started.</p>