The Bulletin 73 



fertilizer. This fertilization was therefore at a loss, having cost $1.42 

 per acre more annually than the value of the increased yield of corn 

 and 86 cents more than the value of the corn and stover combined. 



Phosphoric Acid and Potash, P K (Plats 3 and 3). This mixture 

 of phosphoric acid and potash gave increased yields on all the plats in 

 the two fields, the average annual increase for three years in i^'ield A 

 being 4.7 bushels of corn and 418 pounds of stover per acre; and for 

 five years in Field B 9.8 bushels of corn and 638 pounds of stover, or 

 an average for the eight years in the two fields of 6.4 bushels of corn 

 and 437 pounds of stover, worth $3.98 over cost of fertilizer on the basis 

 of corn alone, or $6.17 on the basis of corn and stover. 



TsTitrogen, Phosj^horic Acid, and Potash, N P K (Plats 5 and 4). By 

 combining all three of the fertilizer materials to make a complete fer- 

 tilizer, increased yields Avere obtained on the two plats in the two fields, 

 the average annual increase for three years in Field A was 4.7 bushels 

 of corn and 418 pounds of stover per acre; and for five years in Field 

 B 9.2 bushels of corn and 724 pounds of stover, or an annual average 

 increase for the eight years in the two fields of 6.95 bushels of corn and 

 571 pounds of stover, worth $2.35 over cost of fertilizer on basis of 

 corn alone, or $5.21 on basis of corn and stover. 



Lime, L (Plats 12- and 11-). 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 Field A during three years there was a profit of $2.93 

 per acre from the use of lime, counting the value of corn and stover. 

 On the plat in Field B there was a loss of 73 cents per acre annually, 

 the average for the eight years being a gain of $1.14 per acre. 



^Complete Fertilizer with Lime, N P K L (Plats 14- and 122). 

 When lime was used in combination with the three fertilizer constitu- 

 ents on Field A, there was an average increase of 4.9 bushels of corn and 

 578 of stover more from the JSF P K L application than from N P K. 

 The increase was not uniform for the different years, in fact in 1905 

 the JNT P K application produced 6.3 bushels of corn and 208 pounds of 

 stover per acre more than did the application of JST P K L. The lime 

 was applied to this field during May, 1903. The average increase in 

 Field B from lime used Avith a complete fertilizer over a complete fer- 

 tilizer alone was 4 bushels of corn and 75 pounds of stover per acre. 

 The increases of shelled corn were in each year uniformly larger from 

 the ]Sr P K L than from the JST P K application. 



On an average, taking the results of both fields together, there was an 

 increase due to the lime above the cost of the lime to the value of 

 $2.93 per acre on the basis of corn alone and of $4.56 on the basis of 

 corn and stover together. 



As an average of all the results, the experiments show: 



(1) That a nitrogen and phosphoric acid mixture added decidedly 

 to the increased yields and profits, the average annual increase being 

 worth $6.60 per acre above the cost of the fertilizing materials; 



(2) That nitrogen and potash combined increased the yield very 

 slightly but at a loss ; 



(3) That on an average phosphoric acid and potash yielded 1.7 

 bushels of corn and 184 pounds of stover less than did the combination 

 of phosphoric acid and nitrogen ; 



