EXPERIMENTS WITH POTATOES 



111 



Comparison of Cost. 



The fertilizers were both purchased on the market at regular 

 prevailing prices. x\s the ready-mixed kinds came all ready for 

 preparation, one dollar ($1.00) is added to the cost of the home- 

 mixed fertilizer. 



The following table shows the comparative cost per acre : 



KIND. 



Cost per Bushel. 



Cost per Acre. 



Total. Large Potatoes. 



Stockbridge Manure. 

 Home-mixed 



$28.50 

 1982 



$0.08-i=»j 

 •05/o 



$0.10i 



It is evident from the above experiment that while the yield 

 remains about equal, there is a saving of approximately $8.68 

 per acre where home mixing is practised. 



Prices of commercial fertilizers have changed of late, and 

 using the present prices, which would represent our present 

 conditions (the spring of 1904), the difiference per acre of saving- 

 would be $7.10. Stockbridge Special Manure is quoted at $36.50 

 per ton, or using 1,500 lbs. per acre = $27.38. With current 

 prices for chemicals the home mixture would cost $19.28 plus 

 $1 for mixing r= $20.28. 



Experiment II, 



Comjyarison between the New York and New Jersey Honie- 

 mixed Formula and that of New Hampshire. 



Many experiments have been carried en- in the states of New 

 York and New Jersey on determining the best proportions of 

 commercial fertilizers for potato culture. The following mix- 

 ture seems to be the one most commonly adopted and recom- 

 mended by the Experiment Stations of these respective states: 

 Nitrogen, 3.9 per cent; phosphoric acid, 8 per cent.; and 

 potash, 10 per cent. The ingredients used are as follows: 



S 150 lbs. nitrate of soda. 



Nitrogen, 3.9 per cent. . 



Phosphoric acid, 8 per cent. 

 Potash, 10 per cent. 



^ 180 lbs. sulphate of ammonia. 

 750 lbs. bone black. 

 300 lbs. muriate potash. 

 120 lbs. makeweight. 



Total 1,500 lbs. 



