POTATOES, 59 



per acre of muriate of potash added. The only differ- 

 ence in treatment between this plot and the preceding 

 one was the addition of muriate of potash. What was the 

 result ? Here, the yield was at the rate of 230 bushels 

 per acre. Notwithstanding this large yield, only about 

 one-fifth of the potatoes were small in size. 



This remarkable increase leads to the conclusion that 

 potash is the element which exerts the most marked effect 

 upon the yield of potatoes. 



CORN* 



The experiments illustrated on the following page 

 are described in Bulletin No, 45, published in 1893, of the 

 Kentucky Experiment Station. 



Here the results of the use of different fertilizers 

 upon corn and fodder are plainly illustrated. Plot No. 10 

 in the above received an application of nitrogen only, but 

 shows no increase over the unfertilized plot. Plot No. 5, 

 which received nitrogen and phosphoric acid, shows but a 

 slight increase over the nitrogen plot. On plot No. 6, 

 where potash was added to the nitrogen, the yield was 

 increased from 27 bushels to 61.7 bushels per acre, or 

 129 per cent. On plot No. 3, which received potash, 

 phosphoric acid and nitrogen, the yield was almost 

 identical with Plot No. 6 ; this shows plainly that potash 

 is the regulating ingredient in a fertilizer for corn upon 

 toil such as that where the experiments were made, and 



