The Bulletin- 21 



a loss of $1.91 per acre, and even including stover the loss per acre 

 was $1.74. 



Nitrogen, Phosphoric Acid, and Potash, N" P K (Plats 1-, 10, and 11). 



Wlien all three of the fertilizer materials were used together to make 

 a complete fertilizer average increased yields were obtained on all three 

 plats. The average annual increase on "Old Field" being 3.2 bushels 

 of corn per acre, for three years in Field A 0.7 bushels, and for the two 

 years on Field B 3.3 bushels, or an annual average increase for the 

 seven years in the three fields of 2.2 bushels, worth $1.82 less than the 

 cost of fertilizer on the basis of corn alone, or 67 cents less on the basis 

 of corn and stover. 



Lime, L (Plats S^ and 63 and 53). 



Lime was applied at the rate of 500 pounds rock or 1,000 pounds 

 slaked lime per acre every fourth year. On the plat in "Old Field" 

 during two years there was a loss of 37 cents per acre from the use 

 of lime. On the plat in Field A there was a gain of $2.58 annually 

 per acre, and on the plat in Field B in two years' test a profit of $2.78 

 the average for the seven years being a profit of $1.79 per acre. 



Lime with a Complete Fertilizer, IST P K L (Plats 9^, 73 and 63). 



When lime was used in combination with the fertilizer constituents 

 there was less corn produced on the plat in "Old" Field than where the 

 three fertilizer constituents were used without lime, but on the plats on 

 Fields A and B there was a decided gain for the use of lime all three 

 years. For the average of two years on "Old" Field lime and complete 

 fertilizer gave an annual loss of $8.89, but on both A and B it was ap- 

 plied with a decidedly greater profit than a complete fertilizer alone. 

 The reduced yield in "Old" Field is due largely to the lack of uniformity 

 of the land. 



From an average of all the results the following is evident: 



(1) That nitrogen and phosphoric acid gave an average increase of 

 3.6 bushels of corn in each of the three fields. This increase in grain 

 was not enough to pay for the fertilizer but when the increase in stover 

 is also considered the applicatioii gave the small profit of 60 cents. 



(2) That nitrogen and potash gave even a smaller average increase 

 than did nitrogen and phosphoric acid; this increase being only 2.1 

 bushels. Considering the grain alone this represents a loss of 84 

 cents and a profit of 23 cents when stover also is included. 



(3) That phosphoric acid and potash fail to give an increase on any 

 of the fields and consequently was in all cases applied at a financial loss. 



(4) That the use of nitrogen, phosphoric acid and potash combined 

 in a normal mixture gave an increase on all three fields but this in- 

 crease was not enough to pay for the fertilizer application. 



(5) That lime alone gave a small profit. 



(6) That lime in addition to a complete fertilizer gave marked in- 

 crease in yield and was accompanied with profit. 



