Abstract⎯Agrochronosequences of chernozems with different periods of their use in rainfed farming with application of traditional technologies have been studied in a typical forest-steppe area in Belgorod oblast. Certain stages in the development of these soils during more than two centuries of their agricultural use have been identified. These stages are related to changes in the intensity and direction of soil forming processes, such as soil compaction, soil aggregation, dehumification of the upper horizons, calcification of the soil profiles, argillization, etc. A significant impact on the soil changes during the agrogenic evolution of chernozems is exerted by the digging activity of burrowers, which is especially pronounced in the old-arable chernozems.Keywords: chernozems, soil agrochronosequences, tillage, forest-steppe, stadial specificity of the agrogenic evolution, multiple study methods DOI: 10.1134/S1064229317050040 Kozlovskii [17], and many other scientists. These studies allowed us to gain a better understanding of the essence of soil forming processes in plowed chernozems and their changes with time and to develop a set of methods aimed at conservation and reproduction of these soils as the most valuable nature resource of Russia. However, the diversity of the existing information on transformation of chernozems under the impact of tillage poses new problems related to the genesis of the new soil properties and processes in plowed chernozems. The changes in the morphogenetic character of plowed chernozems and in the intensity of a number of soil processes (in particular, dehumification) in them should be specially analyzed. It should be noted that, in some studies, the most important problem of the loss of organic matter from chernozems under the impact of tillage is considered not quite correctly: only the content of humus in the plow horizons is analyzed, whereas changes in the bulk density of the soils are ignored.