New York Agricultural Experiment Station. 



Ill 



slightly over the crop produced by the use of 1,000 pounds of 

 fertilizer, the increase being 1.3 per cent in 1895 and 2.6 per cent 

 in 1896, the average increase for the two years being about 2 per 

 cent. 



3. Relation op Yield to Cost of Fertilizer Used. 

 We have seen above that the application of fertilizers produced 

 an increased crop having a larger proportion of marketable pota- 

 toes. Considered from the standpoint of economy, it is essential 

 that we know how much the increased production cost and 

 whether it was made at a profit or loss. We present only a 

 summarized form of our results covering the two years of work. 



Table Showing Fertilizer Cost of Potato Crop. 



The foregoing tabulated results enable us to make the follow- 

 ing statements: 



(1) During the two years the use of 2,000 pounds of fertilizer 

 an acre increased the yield of potatoes 18^ bushels over the yield 

 produced by the use of 1,000 pounds of fertilizer. 



(2) This increase of 18^ bushels cost |16.37 or 88| cents a 

 bushel and was produced at a marked loss. 



(3) The use of 1,000 pounds of fertilizer an acre increased the 

 crop during two years by about 88 bushels of marketable potatoes 

 over the unfertilized portions. 



(4) Deducting the cost of 1,000 pounds of fertilizer, we find 

 that there was a net gain of |27.58 an acre for the two years. 



(5) The use of 2,000 pounds of fertilizer an acre, as compared 

 with the use of no fertilizer, gave a net gain, during the two 

 vears. of .f20.46 an acre. 



