The Bulletin. 



Continued, 

 YEARS OM FIELDS A. B. AND C. 



uniform increase or decrease in the natural fertility between check plats, and a corrected check was figured on 

 this basis for each treated plat between checks. 



150 to 900 pounds per acre. During the four years in Field B the 

 largest profit was from the 450 pound application of fertilizer, the 

 average yield being 39 bushels per acre, at a profit of $14.03 over 

 cost of fertilizer on basis of corn alone, or $20.89 on basis of corn 

 and stover. In this field 750 pounds of fertilizer per acre gave an 

 average yield of 41.3 bushels corn per acre, at a profit of $12.18 over 

 cost of fertilizer for corn alone. Duriiio; two vears in Field A 300 

 pounds of fertilizer gave the largest profit, the yield of corn being 

 37.7 bushels per acre, while in one year in Field C the largest in- 

 crease ill yield and profit was from 450 pounds of fertilizer per 

 acre. 



