EN
The researches were conducted in the contact zone of organic and mineral compound. It is also contact zone between hydrogenic and lithogenic landscapes. The natural contrast between them was modified by aeolian sand deposits in the valley. In that conditions the contrast rates of chemical properties (N, P, K, loss of ignition), were reduced from 5-10, to 2-3. Another factor modifying the primary conditions was muck process. In a consequence a few zones with different physical and chemical properties of soil were observed.