The validation of soil water erosion models based on fundamentals physical processes needs information about the values of their parameters obtained under local conditions. A field study was carried out on a sandy clay loam Palleudult soil in order to evaluate the water erosion in interrill areas under the tillage and management soil systems of no tillage and conventional tillage on bare soil and on soil with residues incorporated. The experimental design was based on field experiments to determine soil erodibility using WEPP (Water Erosion Prediction Project) model. Simulated rainfall with intensity of about 60 mm h-1 was applied during 70 minutes and runoff samples were collected from the interrill plots. Interrill soil loss was significantly smaller in no-till treatment than in conventionally tilled treatments. Interrill erosion rates and water loss rates increased with the period of time of rain up to a maximum value and decreased after that, with the exception of no-till treatment where it increased during all rainfall period. The value of the soil interrill erodibility is Ki = 2.83x10(6) kg s m-4.
interril soil erodibility; erosion prediction; water erosion; conventional tillage
