198 AGRICULTURAL EXPERIMENT STATION. [Jan. 



Cost per Ton 

 Phosphatic slag, . 

 Mona guano (West Indies), . 

 Florida rock phosphate, 

 South Carolina j^hosphate (floats), 

 Dissolved bone-black. 



Analyses of Phosphates used. 



[I., phosphatic slag; II., Mona guano ; III., Florida phosphate ; IV., South Carolina 

 phosphate ; Y., dissolved bone-black.] 



$15 00 

 15 00 

 15 00 

 15 00 



25 00 



In 1890 potatoes were raised on the plats ; in 1891 winter 

 wheat was the crop experimented with (for details see ninth 

 anntial report). The following fertilizing mixtures have 

 been applied annually to all plats, with the exception of 

 Plat 3, which received in 1890 ground apatite and in 1891 

 no phosphate whatever : — 



