29 



RESULTS OF THE ADDITION OF POTASH aO 



Nitrate Nitrate 

 of Phosph'ic and Phos- Average 



Nothing. Soda. Acid. ph'icAcid. Result. 



Hard corn, bushels per acre, 8.5 8.6 10.5 10.7 9.6 



Stover, pounds " 770 1455 749 927 975 



Value of average net increment, $9.16 



Financial result, 5.96 gain 



RESULT OF THE ADDITION TO NOTHING OF 



Hard corn, bushels per acre, 

 Stover, pounds " 



F< 



Value of increment due to $13.27 

 Financial result. 



The striking benefit of potash as compared with nitrogen and phos- 

 phoric acid is clearly brought out by these comparisons ; although a 

 considerable degree of general exhaustion is indicated by the com- 

 paratively large increase due to adding either nitrogen or phosphoric 

 acid to both the other elements. 



Here, as shown by the last of the above tables, the manure pro- 

 duced a larger increase than "complete fertilizer." It supplied 

 about four times the nitrogen ; one and a fourth times the phosphoric 

 acid, and one and three- fouMhs times the potash furnished by the 

 latter. That its richness in potash as 'ompared with manure used 

 by other experimenters makes it especially suited to this soil has been 

 pointed out. 



For corn on this soil I should recommend the use of fertilizer rich in 

 potash and phosphoric acid and with a small x>ercentage of nitroge^i. 



