Аннотация:The paper characterizes the solid phase of agro-gray soils. In all studied profiles geochemical conjugate soil catenas revealed textural differentiation in the content of granulometric fractions. On the basis of the study of granulometric composition, gross soil composition, Mineralogy of coarse fraction, specific surface features of the formation of the second humus horizon are revealed. For this purpose, such characteristics as the coefficient of afforestation, texture similarity index are involved.