PHYSICAL PROPERTIES OF SOILS 25 



mechanically, for general grain production. There are 

 a number of different types of grass and grain soils, 

 with different proportional amounts of sand, silt, and 



Clay 



Fine 

 Silt 



Silt 



Very 

 Fina 

 Sand 



i. Heavy wheat soil. 



''' 



FIG. ii. Soil Types. 



2. Average wheat soil. 3. Medium wheat and grain 

 soil. 4. Corn soil. 



clay. Silt soils, however, form the largest part of the 

 grain soils of the United States. 



16. Wheat Soils. For wheat production; soils of 

 closer texture are required than for other small grains. 

 There are three classes of wheat soils. In the first 



