1892.] 



PUBLIC DOCUMENT — No. 33, 



201 



(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. 



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

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



The following fertilizers were applied to the different plats 

 April 17, 1890: — 



f 127 pounds of ground phosphatic slag. 



•< 43 pounds of nitrate of soda. 



(_ 58 pounds of potash-magnesia sulphate. 



Plat I. (south side), 6,494) .., , #.«.«. - , 



\ /» > j 43 pounds or nitrate of soda. 



square ieet, . . . / co , - , 



Plat II., 6,565 square feet, 



128 pounds of ground Mona guano. 



43-^- pounds of nitrate of soda. 



59 pounds of potash-magnesia sulphate. 



