258 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-black.] 



The following fertilizer mixtures have been applied annually 

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

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



Annual Supply of Manurial Substances. 



Plat 1 (south, 6,494 square feet). 

 Plat 2 (6,565 square feet) , 

 Plat 3 (6,636 square feet), 

 Plat 4 (6,707 square feet), 

 Plat 5 (6,778 square feet), 



Ground phosphatic slag, 

 Nitrate of soda, . 

 Potash-magnesia sulphate, 

 Ground Mona guano, . 

 Nitrate of soda, . 

 Potash-magnesia sulphate, 

 Ground Florida phosphate, 

 Nitrate of soda, . 

 Potash-magnesia sulphate. 

 South Carolina phosphate. 

 Nitrate of soda, . 

 Potash-magnesia sulphate, 

 Dissolved bone-black, . 

 Nitrate of soda. 

 Potash-magnesia sulphate. 



127 

 43 

 58 



128 

 43i 

 59 



129 

 44 

 59 



131 

 44i 

 60 

 78 

 45 

 61 



