222 AGRICULTURAL EXPERIMENT STATION. [Jan. 



Cost per Ton. 



Phosphatic slag, $15 00 



Mona guano (West Indies), 15 00 



Florida rock phosphate, 15 00 



South Carolina phosphate (floats), . . . . . . 15 00 



Dissolved bone-black, 25 00 



Analyses of Phosphates used. 



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

 phosphate; V., dissolved bone-l)lack.] 



The following fertilizer mixtures have been applied annually 

 to all the plats, with the exception of Plat 3, which received 

 in 1890 ground apatite and in 1891 no phosphate whatever : — 



