Abstract
The influence of the orientation of simulated tractor ruts on soil-erosion processes on a silty loamy topsoil with varying moisture content is studied. A sediment-transporting capacity equation is used to calculate the erosion efficiency in different experimental situations. The experiments show that the erosion resistance of wheel tracks is strongly limited. A compacted topsoil, that is rewetted at once after a long dry period, is very sensitive to severe erosion. In particular, tracks formed by tractors that have driven upslope can provoke linear erosion. Rill development in a wheel track can proceed very rapidly owing to the formation of numerous headcuts.
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