SOIL COMPOSITION 



95 



"Orangeburg soils. The Orangeburg soils are gray to brown upland 

 soils, with a red or yellowish clay sandy subsoil. The red color of the sub- 

 soil distinguishes the Orangeburg soils from the Norfolk soils. The red soils 

 appear to be more productive, and are generally stronger than the correspond- 

 ing soils of the Norfolk series. The Orangeburg soils are widely distributed, 

 especially in East Texas. 



"Lufkin soils. The Lufkin soils are gray, with heavy, very impervious 

 plastic gray and mottled subsoils. These soils are generally lower in agricul- 

 tural value than the Norfolk and Orangeburg soils, perhaps on account of the 

 nature of the subsoils. These soils are found in Houston, Lamar, and Travis 

 counties, of the areas studied. 



" Susquehanna series. These are gray and brown surface soils with heavy 

 plastic mottled subsoils. They differ from the Lufkin series in the color of sub- 

 soil. They are generally of low productiveness. 



"Houston series. These are black calcareous prairie soils, very productive 

 and durable. They are among the best soils of the state. Some of them have 

 been in cultivation forty or fifty years without fertilizer, and though some of 

 them have decreased somewhat in fertility, they are still productive. They 

 are found, in areas surveyed, in Lamar, Hays, Travis, and Bexar counties. 

 They are of general occurrence in the east-central portion of the state. 



"These soils appear to owe their productiveness to their content of lime and 

 organic matter, and nitrogen. Some of these soils will become deficient in 

 phosphoric acid. 



" Yazoo soils. These soils are bottom land, generally subject to overflow 

 and very productive. The soils are mapped in only two areas, Anderson and 

 Travis counties. " 



The following tabular statement gives the average amounts of 

 total nitrogen, acid-soluble phosphorus, and acid-soluble potassium 

 in 2 million pounds of the surface soil of these different soil types, 

 based upon the analyses reported by Doctor Fraps. 



TABLE 19.2. AVERAGE COMPOSITION OF SOME TEXAS SOILS 

 Pounds in 2 Million of Soil 



