. Yearbook of the United States Department of Agriculture 1912 . sandy loam. It is well charged with partly decayed organic matter,and it is usually soft and friable and not liable to bake or clod. Im-mediately under the surface soil there is usually a gradation into agray or drab sandy clay layer which, at depths greater than 2 feet,becomes a mottled gray, yellow, and red compact sandy clay. Thecolorations of both surface soil and subsoil are certain indications ofless complete drainage than is possessed by the soils of the Norfolkseries. The accumulation of organic matter in the surface soil
. Yearbook of the United States Department of Agriculture 1912 . sandy loam. It is well charged with partly decayed organic matter,and it is usually soft and friable and not liable to bake or clod. Im-mediately under the surface soil there is usually a gradation into agray or drab sandy clay layer which, at depths greater than 2 feet,becomes a mottled gray, yellow, and red compact sandy clay. Thecolorations of both surface soil and subsoil are certain indications ofless complete drainage than is possessed by the soils of the Norfolkseries. The accumulation of organic matter in the surface soil showsa moist to swampy surface condition, while the gray and mottledcolors of the subsoil indicate that the access of air has not been suffi-ciently free to oxidize or rust the iron-bearing minerals to thecharacteristic yellow or red colors. That the subsoil is now possessedof a fair degree of internal drainage is shown by the partial mottlingof the subsoil where air has penetrated into crevices within it. Yearbook U. S. Dept of Agriculture, 1912. Plate XLIII. CHARACTERISTIC LOCATION OF THE TRUCKING SOILSOF THE NORFOLK AND PORTSMOUTH SERIES. ^^Norfolk loam Coastal Beach Norfolk finesandy loam Norfolk fine sand Portsmouth sand Portsmouth Leonardtown sandy loam loam g Swamp US o( *«ncu!tu-». 1913 Plate XLIV.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecteggsuni, bookyear1913
