EXPERIMENTS WITH POTATOES 



113 



The New Hampshire mixture, which is made up to comply 

 with the usual elements used, namely, nitrogen, 3 per cent., 

 phosphoric acid, 6 per cent., and potash, 10 per cent., was as 

 follows: 



Nitrogen, 3 per cent. . 



Phosphoric acid, 6 per cent. 

 Potash, 10 per cent. . 



150 lbs. nitrate of soda. 

 112i lbs. sulphate of ammonia. 

 565| lbs. bone black. 

 300 lbs. muriate potash. 

 375 lbs. makeweight. 



Total 1,500 lbs. 



The culture and conditions in this experiment were the same 

 excepting the amounts of commercial fertilizers above indicated. 

 At harvest time the results were as follows: 



From the above it is shown that there was little difference in 

 the total yield, but the experiment favored the New York and 

 New Jersey mixture both in number of large potatoes and in 

 total yield. 



Comparison of Cost. 



The difference in the cost of the two fertilizer mixtures is 

 easily figured out. The New York and New Jersey mixture 

 contained Qlh lbs. each of sulphate of ammonia, and 197i lbs. 

 of bone black more than the other mixture, which at the usual 

 rate would cost $5.33. If we divide this by the number of 

 bushels that the New York formula produced over the other, or 

 8^ bushels of marketable potatoes, the cost per bushel for the 

 excess would be 64 cents. 



From this experiment we would conclude that considering 

 everything, the New Hampshire mixture is of equal value to 

 that of the New York and New Jersey formula. 



