FERTILIZERS 



29 



very poor until humus has been supplied. This 

 can be done by planting crops like clover, cow 

 peas, or rye, and plowing them under ; or it may be 

 provided by adding manure to the soil. For the 

 ordinary garden, the application of manure is the 

 most convenient method and the most useful. For 

 these reasons, it is not well to depend entirely on 

 commercial fertilizers, unless the soil is very rich 

 in vegetable matter. Dressing of some kind should 

 be added to most soils each year, in order to keep 

 the earth well filled with humus. 



What One Boy Accomplished with One Twentieth of an Acre 



