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acres affected Agricultural Statistics America amount animal annual anticyclonic areas beets Brazil bushels cane cattle Chapter chernozem climate coal coast commercial controls corn cotton crop crop rotation cultivated cyclonic Department of Agriculture deposition discussed earth economic significance economic-geographic erosion factors Fair Fair farm farmer feet fiber flax forest grain growing season harvesting heat henequen humidity important inches increase industry irrigation isobaric jute labor Lake land latitudes manufacture material meat metamorphic rock miles mill million moisture mountain North North America plant plantation population pounds precipitation production railroad rain regions regolith River rock rubber secondary circulation seed short tons sisal Soil Conservation Service sorghum South steel stream sugar supply surface Table temperature thousand tion tons topography transportation tree tropical U.S. Weather Bureau United utilization valley vegetation Washington weather wheat wind winter wood pulp wool yarn yield York