14 



RESULTS OF THE ADDITION OF PHOSPHORIC ACID TO 



Nothing. 



Hard corn, bushels per acre, -1.6 

 Soft corn, " '' 



Stover, pounds " 27 



Value of average net increment, 



Financial result, 



RESULTS OF THE ADDITION OF POTASH TO 



Nitrate Niti-ate 



of Pliosph'ic and Phos- Averaj 



These comparisons make it evident that on this soil potash was 

 the ingredient most needed ; but it produces its most marked increase 

 when used with nitrogen and phosphoric acid, and more when used 

 with either of these singly than when used alone. A large share of 

 the profit on its use is due to the increase in stover. 



Nitrogen proves moderately beneficial, especially when added to a 

 plot which had received also potash. It is probable that this influence 

 is due to the quicker start which it gives to the crop, sustained by the 

 potash later in the season. 



It should be noticed that the " complete fertilizer " produces a 

 much larger increase than the manure, although it furnishes less tlian 

 one-third the nitrogen, only about two-thirds the phosphoric acid and 

 four-fifths the potash supplied by the latter. 



