184 



FARM AND SCHOOL PROBLEMS. 



The conception of a fertile soil where agriculture has been 

 carried on for many centuries is that a soil is fertile when it is 

 responsive to fertilization, instead of one that is capable ot 

 producing crops without fertilizers. 



The following i6o-acre farm in a splendid state of fertility 

 is used here as a concrete example that offers to the student the 

 solution of the problem of maintaining fertility : 

 A Typical Five-year Rotation. 



Suppose the above farm to be run on a five-year rotation 

 corn, oats, wheat, meadow and pasture; allowing 10 acres foi 

 garden, orchard, lots, lanes, and roads. In five years the total 

 drain of fertility under this system, with the following yields 

 will result as follows : 



(According to Professor Ingle.)* 



* Eminent English authority. 



