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Metadata only record This study compares the effects of four tillage systems on tillage erosion (downslope soil translocation): moldboard plough versus ridge tillage combined with an open field or contour natural grass barrier strips. The results show that both ridge tillage and the grass barrier strips significantly reduce soil loss.

Rainfall erosivities as defined by the R factor from the universal soil loss equation were determined for all events during a two-year period at the station La Cuenca in western Amazonia. Three methods based on a power relationship between rainfall amount and erosivity were then applied to estimate event and daily rainfall erosivities from the respective rainfall amounts. A test of the resulting regression equations against an independent data set proved all three methods equally adequate in predicting rainfall erosivity from daily rainfall amount. We recommend the Richardson model for testing in the Amazon Basin, and its use with the coefficient from La Cuenca in western Amazonia.