1915. 



PUBLIC DOCUMENT — No. 31. 



35 a 



North Corn Acre. 

 In this experiment we have had under comparison for twenty- 

 five years two fertilizer mixtures, in one of which the percentage 

 of potash is high and that of phosphoric acid low ; while in the 

 other (which represents about the average analysis of the com- 

 mercial corn fertilizers offered on our markets) the percentage 



