44 



The Bulletin, 



Table IV— 

 AVERAGE RESULTS FOR SEVEN 



Number 



of 



Plat. 



Fertilizer Application per Acre. 



o 





« M 



O 0) 



°& 



13 



Pk 



o 

 &( . 



a ^ 



PL, 



Yield in Busheb 



of Shelled Corn 



per Acre. 



1903 : 1904 ; 1906 



69.2 pounds 13% blood=--- ..X= 9 



6M9-16 i'ilSO pounds 1-1% acid phosphate= - P= 21 



67.5 pounds 20% manure salt= 3K= 



13.5 



The check for plat 8, Field A, has been obtained from plats 4 and 11: that for plat W, Field B, from plats 

 5* and 142, and for plat 6', Field B, from plats 5' and 14'. It has been assumed that there is a uniform increase 



THE EFFECT OF DIFFERENT QUANTITIES OF POTASH. 



The experiments reported in Table IV were arranged to show the 

 effect on the yield of corn and stover of varying quantities of potash, 

 the. nitrogen and phosphoric acid remaining constant. On one plat 

 only one-half the normal quantity of potash was applied or % per 

 cent in the fertilizer mixture, or 2.2 pounds of potash per acre. On 

 two other plats two and three times the normal quantities were 

 given, or 9 and 13.5 pounds per acre respectively. This would 

 make the application of potash on the several plats 2.2, 4.5, 9, and 

 13.5 pounds. The results in all of the fields are uniform in show- 

 ing that the larger quantities .were not as profitable as the normal 



TABLE V— RESULTS OF FERTILIZER EXPERIMENTS WITH CORN ON IRE 



ON 

 RESULTS ON FIELD B 



