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Journal of Agricultural Research 
Vol. VIII, No. 3 
cient. The type is derived by weathering from argillaceous shales. 
Crop yields are poor, and much of the type is uncultivated. 
CLASS VIII 
Vernon very fine sandy loam. —This type consists of a very fine 
sandy loam 15 inches deep, overlying the subsoil of lighter red color 
and heavy texture. The topography is rolling to hilly and the drain¬ 
age is good or even excessive. The type is of residual origin, being 
derived mainly from the Permian red sandstone. Where the soil has 
not been eroded, com, wheat, and kafir give good yields. 
CLASS IX 
Oktibbeha clay. —This type consists of a heavy yellowish brown 
sandy clay to a depth of 3 feet or more. The topography is rolling to 
hilly, and the heavy soil does not absorb the rainfall; consequently 
erosion is excessive. Very little of the type is now under cultivation. 
Cotton is the principal crop, but yields are low. 
class x 
RiTzvillE SILT loam. —The surface soil is a light-brown silt loam of 
smooth texture and rather compact structure. The subsoil to a depth 
of 6 feet or more is of similar texture and of slightly lighter brown color. 
The topography is undulating to rolling, and drainage is well developed. 
The parent material consists of loessial deposits having a rather cal¬ 
careous composition. The type is devoted mainly to the production 
of wheat under dry farming. 
CLASS XI 
Iredell clay loam. —The soil to an average depth of 4 inches is a 
dark-brown fine loam to clay loam. Quartz fragments are scattered 
over the surface, and small iron concretions are found throughout the 
soil. The subsoil is a heavy, sticky, plastic clay usually of a dark 
yellowish brown color. At a depth of usually 2 % to 3 feet soft, partly 
weathered rock is encountered. The surface varies from level to gently 
rolling. On account of the impervious nature of the subsoil, drainage 
is poor. The type is derived by weathering from diorite and other dark 
basic rocks. Where properly drained and cultivated, this soil is very 
productive, being adapted to cotton, corn, wheat, and alfalfa. 
CLASS XII 
Pheba fine sandy loam. —This soil is a gray to light-brown fine sandy 
loam 6 to 10 inches deep. The subsoil is a yellowish brown, heavy, 
fine sandy loam which gradually passes into fine sandy clay or silty clay. 
The lower subsoil is usually mottled with reddish yellow and gray 
colors. A heavy clay substratum is encountered at from 3 to 6 feet. 
The surface varies from flat to gently rolling. Drainage is required over 
