THE SOIL 



21 



There are three ways of adding humus and plant food to 

 this lifeless land : the first way is to apply barnyard manure 

 (to adopt this method means that livestock raising must be 

 a part of all farming) ; the second way is to adopt rotation 



FIG. 12 



Feeding swine on this worn-out field and then tilling it made the 

 field productive 



of crops/and occasionally to plow under crops like clover and 

 cowpeas ; the third way is to apply commercial fertilizers. 

 Then, to summarize: if we want to make our soil better 

 year by year, we must cultivate well, drain well, and in the 

 most economical way add humus and plant food. 



