The Bulletin 



71 



over cost of fertilizer. The value of the increased yield of corn and 

 stover and of corn alone represent the profit from the several fertilizer 

 applications after paying for the fertilizer itself. 



In these experiments the corn was cut, shocked and shredded, the 

 stover heing all of the plant except the corn on the cob. 



Nitrogen and Phosphoric Acid N P (Plats 1 and 1). A combina- 

 tion of nitrogen and phosphoric acid increased the yields over the un- 

 fertilized plats in all eight years in the two fields, the average annual 

 increase for the three years in Field A being 6.5 bushels of corn and 514 

 pounds of stover per acre; and for five years in Field B 9.6 bushels of 

 corn and 727 pounds of stover; or an average annual increase for the 

 eight years in the two fields of 8.1 bushels of corn and 621 pounds of 

 stover worth $3.49 over cost of fertilizer for corn alone, or $6.60 for 

 the increased yield of corn and stover. 



Nitrogen and Potash, N K (Plats 2 and 2). There were small aver- 



TABLE VII. 



-RESULTS QF FERTILIZER EXPERIMENTS WITH CORN AT THE CENTRAL 



TEST FARM. 



