Terracing is the only practice that we now have that will control erosion on all land slopes under the cropping systems now being used in Iowa. Current research has proved the effectiveness of terraces in controlling erosion. Developments in terraces and terrace systems, such as making the terraces parallel, use of tile outlets, and changing the cross section and method of construction, have eliminated most of the farmer\u27s objection to farming with terraces. Terraces are effective and will be required, not only to protect erosive cropland, but also to decrease the sediment loads in the surface waters of the state
