94 



SCIENCE AND SOIL 



700 pounds, while 4100 pounds of phosphorus per acre (in a 6f -inch 

 stratum) have been found in an upland soil of limestone origin. 

 The " black prairie " limestone soils found in limited area in 

 northeastern Mississippi and in northwestern Alabama are as a 

 rule well supplied with phosphorus. This formation is apparently 

 an extension of that found so commonly in the broad Central Basin 

 of Tennessee, which also extends into Kentucky, where it again 

 expands into the great Blue Grass Region. 



An analysis made by Doctor H. C. White of a sample of soil 

 representing the University farm of Georgia, collected in March, 

 1884, from land that " had been cleared in December (1883) of a 

 second growth of oak and hickory," gave the following amounts 

 per acre based upon the surface foot, which was assumed to weigh 

 3,528,000 pounds. 



TABLE 19.1. COMPOSITION OF GEORGIA SOIL (UNIVERSITY FARM) 



The original statement reports " sand and clay," and it must be 

 assumed that the mineral elements as given above represent the 

 amounts soluble in strong acid. 



The Texas Experiment Station has analyzed a considerable 

 number of soil samples collected to represent six general groups or 

 " series," as mapped and named by the United States Bureau of 

 Soils. The following descriptions are taken from Texas Bulletin 

 99 (1907) = 



"Norfolk soils. These are light-colored upland sandy soils, with a yellow 

 clay or sandy clay subsoil, usually with good drainage. 



" Of the areas under study, the Norfolk soils are found in Anderson, Houston, 

 and Bexar counties. They are widely distributed in the eastern part of the 

 state. 



