50 a 



EXPERIMENT STATION. 



[Jan. 



Field G, Comparison of Potash Salts. 



This is the nineteenth year of this experiment which has for 

 its object the study of seven different materials which may be 

 used as sources of potash. There are 40 plots in all, 5 check or 

 no-potash plots, and 5 plots on which each of the different 

 potash materials are used. All plots receive an annual applica- 

 tion of nitrogen and phosphoric acid. The different materials 

 used as sources of potash are kainit, high-grade sulfate, low- 

 grade sulfate, muriate, nitrate, carbonate and feldspar. 



The crop during the past year was mixed grass and clover. 

 The following table shows the average yields per acre with 

 each material furnishing potash : — 



Potash. 



No potash, 



Kainit, .... 

 High-grade sulfate of potash, 

 Low-grade sulfate of potash. 

 Muriate of potash, . 

 Nitrate of potash, . 

 Carbonate of potash, 

 Feldspar, 



