SOIL TYPES 



23 



etable matter and the subsoil about 25 per cent, of 

 limestone in a very fine state of division. For the 

 production of wheat the subsoil should contain 20 per 

 cent, of water. A crop can, however, be produced with 

 less water, but a smaller yield is obtained. 



Oay 



Fine 

 Silt 



5/// 









sUfiflS!'.'.' 



10. Soil types. 



The second type of wheat soil (2 in Fig. 10) con- 

 tains less clay and more silt. Many prairie subsoils 

 which produce good crops of wheat contain about 20 

 per cent, of sand, 50 per cent, of silt, and from 20 to 

 30 per cent, of clay. Soils of this class when well 

 stocked with moisture in the spring are capable of 



