|MadSci Network: Agricultural Sciences|
Farmers use a variety of techniques to control erosion Conservation tillage describes the way they cultivate the land A good web site is http://abe.www.ecn.purdue.edu/~agen521/epadir/ erosion/conservation_tillage.html
They may also use contour planting, terracing, cover crops and a number of other techniques
You can find many answers to your question aat the following site which provides an entry to other sites on soil erosion http://db.uia.org/cgi-shl/oicgi/INET_UIAF
Try the links in the MadSci Library for more information on Agricultural Sciences.