New York Agricultural Experiment Station. 



117 



Amounts of Potash Applied a.nd Removed. 



Attention is called to the following points in connection with 

 the table above: 



(1) When no fertilizer was applied, the crop removed from one 

 acre of soil 46.7 pounds of potash the first year and 35.2 pounds 

 the second year, or a total of 81.9 pounds for the two years. We 

 are justified in saying that this amount represents the minimum 

 amount of potash available for the potato crops at the time 

 grown and under the conditions existing, 



(2) When an application was made in 1895 of 1,000 pounds of 

 fertilizer, an average amount of 90.6 pounds of potash was sup- 

 plied per acre. In 1895 the crop used 59.7 pounds of potash and 

 in 1896, 45.1 pounds, making a total of 104.8 pounds an acre for 

 the two years. The two crops removed about 15 pounds more 

 than was applied. 



(3) When an application was made in 1895 of 2,000 pounds of 

 fertilizer, an average amount of 181.2 pounds of potash was sup- 

 plied per acre. The first year's crop removed 60.4 pounds of pot- 

 ash, the second crop, 49.7 pounds, and the two crops, 110.1 

 pounds. The amount of potash applied exceeded that used in 

 two years by over 70 pounds. 



(4) When we added to the soil 90.6 pounds of potash, the two 

 crops used 23 pounds more potash than when none was applied. 



(5) When the amount of potash applied was increased to 181.2 

 pounds an acre, the two crops used only 5 pounds more than 

 when half that amount was applied. 



