56 THE NEW BUSINESS OF FARMING 



The one additional charge against the higher 

 yield is the cost of harvesting. Land rent, tool 

 hire, labor costs, preparation of soil, are all the 

 same. 



In planning a farm cropping system there 

 are certain general principles to keep in mind. 



A regular rotation gives each year the same 

 number of acres to each crop, hence provides 

 more constant and efficient use for the machin- 

 ery. With a fairly constant supply of crops the 

 amount of stock which can be profitably kept is 

 more easily determined. 



If each field is given the same treatment 

 through each series of years, the supply of 

 humus will be added at regular intervals and 

 an evenly distributed amount of decaying vege- 

 table matter be kept in the soil. Thus every 

 part of the farm will be working at efficient 

 speed. 



