The ideas of Yu.A. Liverovskii about various aspects of studying agrog
enic soils are considered. Data on the plowed soils of the northern fo
rest-steppe zone differing in the degree of their improvement by human
s are discussed. Agrogenic transformation of soils is regarded as disp
laying a dual character that is manifested both in the plow and subplo
w layers. The degree of preservation of former agrogenic features in t
he oldarable soils under restored forest vegetation is analyzed.