498 



BOARD OF AGRICULTURE. 



'■'■ Americus" Ammoniated Bone Superphosphate. 



(Williams, Clark & Co., New York; collected of B. L. Bragg & Co., Springfield 



Mass.) 



Guaranteed composition : Total phosphoric acid, 11 to 16 

 per cent. ; soluble phosphoric acid, 7 to 8 per cent. ; re- 

 verted phosphoric acid, 3 to 4 per cent. ; potassium sul- 

 phate, 4 to 6 per cent, ; nitrogen, 2| to 3| per cent. ; 

 (equivalent to ammonia, 3 to 4 per cent.). 



Moisture at lOO^ C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid, 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Ter cent. 



11.90 

 11.16 

 8.48 

 2.41 

 .27 

 2.48 

 2.73 

 6.00 



Valuation per two thousand pounds : 



169.6 pounds of soluble phosphoric acid, 

 48.2 pounds of reverted phosphoric acid, 

 6.4 pounds of insoluble phosphoric acid, 

 49.6 pounds of potassium oxide, . 

 64.6 pounds of nitrogen, 



fl3 57 



3 62 



16 



2 73 



9 66 



$29 64 



II. L. Phelps' Guano and Potash. 

 (Collected of Prentiss, Brooks & Co., Ilolyoke, Mass.) 



Guaranteed composition : Available phosphoric acid, 4 to 

 5 per cent. ; insoluble phosphoric acid, 2 to 3 per cent. ; 

 potassium oxide, 6 to 7 per cent. ; ammonia, 4 to 5 per 

 cent, (equivalent to nitrogen, 3.3 to 4.1 per cent.). 



Per cent. 



Moisture at 100° C, 13.33 



Total i^hosphoric acid, . 11.03 



Soluble phosphoric acid, 3.04 



Heverted ])hos2)lioric acid, 6.43 



Insoluble phosphoric acid, 1.56 



Potassium oxide, 7.76 



Nitrogen, 3.79 



Insoluble matter, .86 



