New York Agricultural Experiment Station. 615 



Table IX — Proportions of the Important Elements of Plant-Food in 

 THE Fresh Tubers. 



A still briefer summary of the percentages of dry matter and 

 starch is the following: 



Dry Matter and Starch in Potatoes Differently Fertilized. 



The potatoes produced where the sulphate of potash was 

 added contained both more dry matter and more starch than did 

 the potatoes grown where the muriate was used. As these figures 

 are an average of 16 plats for each manner of treatment they 

 would seem to be significant. Their force is diminished greatly, 

 however, by the fact that the adjacent plats receiving no fertilizer 

 differed in the same way and to the same extent. It would not 

 be safe, therefore, to conclude from these data that the muriate is 

 Inferior to the sulphate of potash for potato growing. 



