ABSTRACT
This chapter focuses on agricultural treatments. Tillage reduces runoff temporally but increases its turbidity, maintaining high soil losses. The least erosive cropping methods like contour ridges are unfortunately unsuitable. A proper study scale is essential for the assessment of soil losses. The farmer may find it beneficial to reduce displacements of nutrients and fine elements, and to preserve them within his own land, but not necessarily to retain them at the same place where erosion occurs. The cultivated plots were ploughed by animal traction in direction of slope at the beginning of the wet season. The erosion sediments were separated in two classes: coarse carriage sediments and fine particles in suspension, including micro-particles. Solutes in runoff represented another source of loss. Carriage represents the coarse eroded fractions, which progress by saltation and are deposited in plane anfractuosities or on the zones of deceleration or spreading out of the sheet of runoff, for example on grass strips.
