Soil Conservation

acres agricultural annual average Bermuda capacity carried caused cent channel clay climatic considerable construction continuous contour corn cotton cover crops cultivation damage deep developed effective eroded erosion especially established experiment extensive farm farmers feet fields flood forest frequently grass grazing ground growth gullies important improvement inches increased indicated irrigation land less loam localities loss lower material measures methods million Mountains natural nearly necessary needed North northern occur operations original pasture period permanent Photograph by Soil Plains plant plowing practices prevent principal problem production protection rainfall rains range region removed reservoirs result River rotation runoff sand sandy seed severe silt slopes soil and water Soil Conservation Service South southern streams strip structures subsoil surface survey terrace tion topsoil trees United usually valleys vegetation washing water conservation watershed West western wind winter