COINOIERCIAL FERTILIZERS. 



511 



Moisture at 100° C, 

 Total phosphoric acid, . 

 Soluble i^hosphoric acid, 

 Reverted phosphoric acid. 

 Insoluble phosphoric acid. 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Valuation per two thousand pounds : 



123.4 pounds of soluble phosphoric acid, 

 61.8 pounds of reverted phosphoric acid, 

 69.8 poimds of insoluble phosphoric acid, 

 61.6 pounds of potassium oxide, . 

 41.6 pounds of nitrogen. 



Per cent. 



17.93 

 12.75 

 6.17 

 3.09 

 3.49 

 3.08 

 2.08 

 4.08 



f9 87 

 4 64 



2 09 



3 39 

 7 28 



$27 27 



Standard Superphosphate. 

 (Collected of Joseph Breck & Sons, Boston, Mass.) 



Guaranteed composition : Total phosphoric acid, 11 to 16 

 per cent. ; available phosphoric acid, 9 to 13 per cent. ; in- 

 soluble phosphoric acid, 2 to 3 per cent. ; potassium oxide, 

 2 to 4 per cent. ; nitrogen, 2| to 3^ per cent, (equivalent 

 to ammonia, 3 to 4 per cent.). 



Per cent. 



Moisture at 100° C, 11.82 



Total ishosi^horic acid, 12.41 



Soluble phosj^horic acid, 7.32 



Reverted phosphoric acid, 2.81 



Insoluble phosphoric acid, 2.28 



Potassium oxide, 1.55 



Nitrogen, 3.04 



Insoluble matter, 1.88 



Valuation per two thousand pounds : — 



146.4 pounds of soluble phosphoric acid, 

 56.2 pounds of reverted phosphoric acid, 

 45.6 pounds of insoluble phosphoric acid, 

 31.0 jjoirnds of potassium oxide, . 

 60.8 pounds of nitrogen, 



$29 26 



