1888.] PUBLIC DOCUMENT — No. 33. 119 



of nitrate of soda (=7 to 8 pounds of nitrogen) and 50 

 pounds of muriate of potash (=25 pounds of potassium 

 oxide). 



No. 3, for several years in succession fertilized with from 

 4 to 8 pounds of nitrogen in form of dried blood, was 

 treated with a mixture of 60 pounds of dried blood (i=7 to 

 8 pounds of nitrogen) and 100 pounds of dissolved bone- 

 black (=z 16 to 17 pounds of available phosphoric acid). 



No. 5, for several years in succession fertilized with 4 to 

 10 pounds of nitrogen in form of sulphate of ammonia, re- 

 ceived as fertilizer a mixture of 50 pounds of ammonium 

 sulphate (r:: 10 pounds of nitrogen) and 97 pounds of 

 potash-magnesia sulphate (=25 pounds of potassium oxide). 



No. 7, for two succeeding years fertilized with from 8 to 

 16 pounds of available phosphoric acid, was treated with a 

 mixture of 100 pounds of dissolved bone-black (= 16 to 17 

 pounds available phosphoric acid) and 50 pounds of muriate 

 of potash ( = 25 pounds potassium oxide) . 



No. 9 was fertilized, as in preceding years, with nothing 

 but muriate of potash, of which 50 pounds were applied 

 (=25 pounds potassium oxide), the same quantity pre- 

 viously used (1886). 



No. 10, in preceding years fertilized with from 12 to 25 

 pounds of potassium oxide in form of potash-magnesia sul- 

 phate, received a mixture of 97 pounds of potash-magnesia 

 sulphate (=25 pounds potassium oxide) and 60 pounds of 

 dried blood (= 7 to 8 pounds nitrogen). 



The corn (Clark) was planted, in the same manner as in 

 the preceding years. May 23. The crop upon the entire 

 field looked uniform and healthy until the middle of July. 

 Subsequently a gradual change in appearance became notice- 

 able. The growth upon the plats which had either received 

 no fertilizer, or one which did not contain potash, turned 

 yellowish, ceased to grow, and produced a few imperfect 

 ears ; while, upon those plats which had been fertilized with 

 a material containing potash, it retained its healthy appear- 

 ance, reached its normal height and produced a liberal num- 

 ber of perfect ears. The entire crop was cut and stooked in 

 the field Sept. 15 ; it was housed, after being weighed, 

 Oct. 17. 



