PHYSICAL COMPOSITION AND CLASSES OF SOILS 97 



corn, sugar-cane, alfalfa, and vegetables; especially adapted to 

 peaches. 



W abash Series. Dark-brown or black soils subject to over- 

 flow. Very productive soils, used for cotton, sugar-cane, corn, 

 wheat, oats, grass, alfalfa, sugar beets, potatoes, and other 

 vegetables. 



Piedmont Plateau. Cecil Series. Gray to red soils with 

 bright-red clay subsoils, derived from igneous and metamorphic 

 rocks. Constituting by far the larger portion of the plateau, 

 these soils are well adapted to and are used for cotton, export 

 tobacco, and fruit, and the lighter members for truck crops. As 

 a rule they are not highly developed, but where properly handled, 

 the heavier members produce excellent crops of corn and grazing 

 and hay grasses. 



Appalachian Mountains and Plateau. Dekalb Series. Brown 

 to yellow soils with yellow subsoils, derived from sandstones and 

 shales. Soils of this series are used, according to texture, eleva- 

 tion, exposure, and character of surface, either for the production 

 of hay, for pasture, or for orchard and small fruit. 



Porters Series. Gray to red soils with red clay subsoils, 

 derived from igneous and metamorphic rocks. This is the 

 most important series for mountain fruits of the eastern United 

 States. It is also used for general farming. 



Limestone Valleys and Uplands. Clarksville Series. Light- 

 gray to brown soils with yellow to red subsoils, derived mainly 

 from the St. Louis limestone. Apples and peaches are com- 

 mercially important. Tobacco is a leading product. 



Cumberland Series. Brown surface soils, derived from the 

 deposit of sedimentary material overlying residual limestone sub- 

 soils. Used for cotton and other general farm crops, truck, and 

 fruit. 



Glacial and Loessial Regions. Marshall Series. Dark-colored 

 upland prairie soils. The principal soils of the great corn belt 

 belong to this series, while in the Northwest the finest wheat soils 

 are found in this group. They are among the best general farm- 

 ing soils of the entire country. 



