EFFECT OF POTASH SALTS ON CROP YIELDS 



47 



scries, and the experience with tlie hay crop was surprisingly similar. With- 

 out exception, however, the stover responded to the use of potash, and 

 the rowen crop responded even on Series 1, 2 and 3. Both observation 

 and photographic record show that, following a new seeding, the first cut- 

 ting consisted largely of grass; while the second cutting, or rowen, was 

 mainly clover. Plate I illustrates this dependence of clover, as grown 

 under the conditions of the experiment, on fertilizer potash. 



Comparison of Different Potash Carriers 



Comparison is made in tiie following table for corn, soy beans, 

 potatoes, and grass and clover, all of which crops were grown a sufficient 

 number of times to make the average results of significance. 



Comparison of Different' Potash Carriers 

 Average Yields per Acre 



Tiie following facts are outstanding: 



I. Kainit was used less successfully than any other source of potash. 

 On soy beans there was an apparent decrease in crop resulting from its 

 u.se. This material is es.sentially low-grade. To secure an amount of 

 potasii equivalent to that in 270 pounds per acre of the muriate, over 1000 



