It is shown, that changes in plant component of natural ecosystems for agricultural development naturally leads to a substantial restructuring regimes, processes, and some properties of chernozems. The approach to arable chernozems as a new component of natural ecosystems (agroecosystems) dictates the principles on which to draw when designing farming practices and farming systems.

At the quantitative level on the basic parameters described in the fertility of the virgin chernozems in zonal-subzonal aspect. The article traces the changes in nitrogen and humus condition at an early stage of development. In terms of reserves of humus and nitrogen chernozems forest steppe and steppe have significant differences: the largest reserves of humus and nitrogen are concentrated in the migration-micellar (typical) chernozems, the lowest - in the texture-carbonate (southern). Scheduled prognosis agroevolution chernozems in the amplification of human impact.