Research on the topic of the dissertation was carried out within the coastal (southern) part of the Azov oblique dissected accumulative-denudated plain and the coastal strip of the coast of the Sea of Azov, the valleys of the lower reaches of the Don and Kalmius rivers. The research area covered the modern territory of cities Taganrog and Rostov-on-Don and a suburban area up to 15-20 km away from the borders of these cities. According to the materials of the USSR soil map with the editorial board M. K. Krupsky (1977), as well as modern schemes of soil zoning in Russia [9] the study area covers the distribution area of ordinary chernozems and partially southern low-humus chernozems on loess rocks. The main zonal soil that we studied was ordinary chernozem. Ordinary warm chernozems with a short freezing period, belonging to the Azov-Ciscaucasian province of powerful and super-powerful chernozems, predominate in the soil cover of the Azov inclined plain, extending from the Donets Ridge to the shores of the Sea of Azov and the lower Don River.