188 AGRICULTURAL EXPERIMENT STATION. [Jan. 



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

 each of these articles controlled the quantity applied, for 

 each ]ilat received the same money value, in its particular 

 kind of phosphate. 



Phospliatic slag, . . • . 

 Mona guano (West Indies), 

 Ground aj^atite (Canada), 

 South Carolina phosphate (lioats), 

 Dissolved l)one-black, . 



Cost per Ton. 



. $15 00 

 . 15 00 

 6 25 

 . 15 00 

 . 25 00 



Analyses of Phosphates used. 



fl. Pliosphatic slaij ; II. Mona guano; III. Apatite; IT. South Carolina pbos- 

 pliate (floats) ; V. Dissolved l)one-black.] 



The following fertilizers were applied to the dilferent plats 

 April 17, 1890^ — 



^, ^ , , . , f 127 pounds of ground ijhosnhatic slair. 



Plat I. (south side), 6,404) ... , . ?^ ^ . , 



^ /' ' - 4, > pounds or nitrate of soda. 



■^ ' ' ■ ■ ■ (^ 58 pounds of jiotash-magnesia suljihate. 



r 128 pounds of ground jMona guano. 

 Plat II., 0,5G5 square feet, . -' 43| pounds of nitrate of soda. 



(_ 59 i^ounds of potash-magnesia sulphate. 



