SOIL AND MAN 



333 



in well-watered re- 

 gions. Sometimes if 

 there is not much 

 alkali, deep plowing 

 or the planting and 

 removal of certain 

 plants such as sugar 

 beets, which are ca- 

 pable of growing in 

 such soils, will 

 sweeten it. 



Soil and Man. - 

 Although nature 

 through countless 

 ages has been preparing the soil, and generation after genera- 

 tion of plants and animals has been contributing to its 



RECLAIMING ALKALI SOIL IN THE SAHARA 



ROMAN PLOWING 

 Showing primitive methods. 



