INTRODUCTION
Nowadays one of the major problems on global scale is the
rapidly increasing demand to the food. This demand is of course
totally parallel to the population growth. Even more land is used
for agricultural purposes day by day. Cultivation without using
specific control techniques, unplanned land use, such as
establishing industrial facilities or constructing summer houses
on the agriculture land, uncontrolled urban development and
also destroying forests are fundamental factors of soil erosion
(Biard and Baret,1997).