You can check soil depletion by:
1. Contour ploughing
Ploughing along contours on a slope prevents soil from being washed away by rains and or by surface run-offs. Contours act like bunds. Terraces are leveled into step-like small fields with even slopes. Doing this is common in Asian countries.
2. Terrace Farming
On hilly slopes, terraces act as bunds and prevent the soil from being washed away by running water. This is practiced in Asia and the USA.
3. Strip Cropping
In this system, crops are grown by alternate strips of land in order to check the effect of the winds.