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affect moisture-storage efficiency age efficiency Arnegard Average annual rainfall average rainfall Black soils Brown soils clay loam close crop closeness of crop closer crop sequence coarseness of soil Colo Dark-brown soils Deaf Smith fallowing was regularly farmers farming practices hard land soils herent highly significant increased moisture-storage efficiency iy2 percent Kans lay on slopes Light-brown soils moisture efficiency natural factors occasional field Okla operational factors period between crops Perryton Plains preparatory period rain range of textures recorded relation to moisture-storage sandier soils sandy loam seasons sequence of crops show significant significant relations Simple correlation slopes of y2 Soil Conservation Service soil stirred soil texture soil-moisture storage South Dakota steeper slopes storage efficiency stubble mulching Summer fallowing temperatures textures on slopes tillage topsoil texture tory period trict Tucumcari ture variations Water conservation methods Water conservation practices weed control Weed growth wide range widely practiced winter wheat area