AMOUNT OF ORGANIC MATTER IN SOIL 



125 



Illinois deep peat and muck 



Miami black clay loam, average 



twelve samples 



Portsmouth sandy loam, average 



nine samples 



Wabash silt loam, average eleven 



samples 



Soil 0-7 inches 



Per cent 

 organic matter 



84.6 

 5.9 

 4.1 

 3.3 



Subsoil 7-40 inches 



Per cent 



organic matter 



55.80 

 2.50 

 0.92 

 1.30 



The Miami black clay loam is a famous corn soil of 

 the North Central states, and comprises areas of glacial 

 clay loam, which were originally very wet and swampy, 

 but have been reclaimed by drainage. The Portsmouth 

 sandy loam occurs in the coastal plain of the southern 

 states, and represents a mild form of swamp soil, but 

 in which the accumulation of organic matter is not 

 sufficient to permit its classification as muck. When 

 well-drained, this soil is a first-class truck soil. The 



