1896.] 



PUBLIC DOCUMENT — Xo. 33. 



129 



per acre and potash-magnesia sulphate at the rate of 390 

 pounds per acre. 



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-black.] 



The following fertilizer mixtures have been applied annu- 

 ally, from 1890 to 1894, to all the plats, with the exception 

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

 1891 no phosphate whatever, on account of the failure of 

 securing in time apatite suitable for the trial. 



