SOIL SURVEY OF LOUISA COUNTY, IOWA. 49 



is forested. The surface soil is characteristically light colored and 

 the subsoil yellowish brown. The type is particularly adapted to the 

 production of wheat. 



The Tama silt loam is another fairly extensive upland type, occur- 

 ring for the most part on prairie areas. The surface soil is dark 

 colored and the subsoil yellowish brown. The Tama is intermediate 

 between the Grundy or Muscatine and the Clinton. While essen- 

 tially a corn soil, it also produces good yields of the other farm crops. 



The Knox fine sand has a brown surface soil and subsoil. It is of 

 small extent, and much of it is uncultivated, though some corn and 

 truck crops are grown. 



The Putnam silt loam is of little importance. It differs from the 

 Grundy and Muscatine soils principally in having a gray subsurface 

 layer. 



The Lindley silt loam occurs on the steep slopes where the loessial 

 material has largely been washed off. It has a light-colored surface 

 soil and a yellowish-brown, sometimes mottled, subsoil. Considerable 

 gravel occurs throughout the 3-foot section. 



The Bremer series is characterized by dark-colored surface soils 

 underlain by heavier textured subsoils. The members of this series 

 are preeminently adapted to the production of corn. 



The Buckner soils are brown, underlain by lighter textured sub- 

 soils. The lighter textured members of the series are used to some 

 extent for the growing of rye and truck crops. 



The Waukesha silt loam has a brown surface soil and a yellowish- 

 bro^^^l subsoil. It is well suited to the production of the farm crops 

 commonly grown, particularly corn. 



The Calhoun silt loam has a light-colored surface soil underlain by 

 a very heavy, mottled subsoil. The type is naturally forested and 

 either is or has been poorly drained. It is of small extent. 



The members of the Wabash series have dark-colored surface soils 

 and heavier subsoils. They are most extensive in the Mississippi 

 River bottoms in the vicinity of Oakville. They are preeminently 

 corn soils, though they also give good yields of the other common 

 crops. Most of the small stream bottoms are occupied by the 

 Wabash loam, and are used as pasture. 



The Cass soils are dark colored, but differ from the Wabash in 

 having subsoils of lighter texture than the surface soils. The mem- 

 bers of the Cass series produce good yields of the common crops, 

 particularly corn. 



Muck is an inextensive type. It is rarely overflowed, but it is 

 marshy and undrained and is not cultivated. It has a surface 

 layer of organic matter, overlying heavy, plastic clay or in places 

 coarse sand. 



