SOILS 



101 



tions as air, temperature, organic material, and freedom from 

 acidity. These are problems in soil physics. 



Effects of lime in the soil. We usually think of lime as 

 relating to soil fertility, but we know that the application 

 of lime to the soil has certain effects upon its physical condi- 

 tion. The application of lime to - sandy soil has a tendency 

 to cement together the particles and give the soil more body, 



FIG. 16. A LIME SPREADER. 



improving its structure and tillage. The application of lime 

 to stiff clay soils or clay loams tends to flocculate the finer 

 particles and open up the soil, giving it more air, making it 

 more friable, and more easily drained. 



SOIL FERTILITY 



The idea to be kept constantly before the student of agri- 

 culture and the farmer is the wise use of the natural resources 



