Contrary to achievement of modern pedology the quality of soil is treated in narrow sense more often. Thereof the quality of soil is identified with fertility of the soil. In the present article the quality of soil and in particular by its physical condition from the positions of the structurally functional concept in interrelation with components of external environment for the first time is examined. Is established, that the functioning of soil ecosystem is determined beside coordinated of hierarchic processes. The degradation of soil results in infringement of ecological balance in the ecosystems. For conservation of soil ecosystem the gradual replacement of industrial technologies by conservative methods of soil cultivation based on optimization of a physical condition of is recommended.