188 AGRICULTURAL EXPERIMENT STATION. [Jan. 



(floats), and dissolved bone-black. The market cost of 

 each of these articles controlled the quantity applied, for 

 each plat received the same money value, in its particular 

 kind of phosphate. 



Phosphatic slag, .... 

 Mona guano (West Indies), 

 Ground apatite (Canada), 

 South Carolina phosphate (floats), 

 Dissolved bone-black, . 



Cost per Ton. 



. $15 00 

 . 15 00 

 6 25 

 . 15 00 

 . 25 00 



Analyses of Phosphates used. 



[I. Phosphatic slag ; II. Mona guano; III. Apatite; IV. South Carolina phos- 

 phate (floats) ; V. Dissolved hone-black.] 



The following fertilizers were applied to the different plats 



April 17, 1890 1 ": — 



("127 pounds of ground phosphatic slag. 



Plat I. (south side), 6,494 ) ,.-, , £ -. . r i 



v Ji 1 J 43 pounds of nitrate of soda. 



' " ,l ' ' (_58 pounds of potash-magnesia sulphate. 



f 12S pounds of ground Mona guano. 

 Plat II., 6,565 square feet, . < 43^ pounds of nitrate of soda. 



(_o9 pounds of potash-magnesia sulphate. 



