Date. 



(18) 



EXERCISE 3 



Study of Soil Grains 



Purpose. — To become familiar with the composition, color, size and the 

 individual particles in a soil and to see clearly the difference between 

 various types of soils. 



Fig. 3. — A suitable form of bin for 

 storing soils in school and college 

 laboratories. 



Fig 4. — Pint tin cans are suitable 

 for use in taking soil samples. The 

 moisture may be held by tightly fit- 

 ting covers. 



1. Obtain from the field or from soil supplies in the laboratory, samples of 



the following soils: sand, sandy loam, loam, clay and muck (Figs. 3 

 and 4). 



2. Examine these soils with reference to the following points and record 



results in the table. 

 When dry: (a) color, (6)odor, (c) fineness or texture — coarse, medium or 



fine. 

 When moist: (a) color, (6) odor, (c) crumbly or plastic. 



*Adapted from Department of Soil Technology, Cornell University. 



