COMMERCIAL FERTILIZERS. 



223 



Soluble phosphoric acid, . 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassiym oxide, 

 Nitrogen (in organic matter). 

 Nitrogen (in nitrates), 



Valuation per two thousand pounds : — 



106.8 pounds of soluble phosphoric acid, 

 88.2 pounds of reverted phosphoric acid, 

 26.4 pounds of insoluble phosphoric acid, 



133.6 pounds of potassium oxide, . 

 49. pounds of nitrogen (in organic matter), 

 11.6 pounds of nitrogen (in nitrates), . 



Standard Superphosphate. 



$11 75 

 3 06 



1 58 

 5 68 



11 27 



2 32 



$35 66 



{Standard Fertilizer Co., Boston, Mass. ; collected of Wm. H. Earle, Worcester, 



Mass.) 



Guaranteed composition ; total phosphoric acid, 13 to 15 

 per cent. ; soluble and reverted phosphoric acid (available), 

 ^ to 13 per cent. ; insoluble phosphoric acid, 2 to 4 per 

 cent. ; potassium oxide, 2 to 4 per cent. ; magnesium oxide, 

 1.5 to 2 per cent. ; ammonia, 2 to 4 per cent, (equivalent 

 to nitrogen, 1.6 to 3.3 per cent.). 



Moisture at 100° C, . 

 Total phosphoric acid, 

 Soluble phosphoric acid, . 

 Reverted phosphoric acid. 

 Insoluble i^hosphoi-ic acid. 

 Potassium oxide. 

 Nitrogen, .... 



Valuation per two thousand pounds : • 



145.8 pounds of soluble phosphoric acid, 

 41.8 pounds of reverted phosphoric acid, 

 55.2 pounds of insoluble phosphoric acid, 

 30.2 pounds of potassium oxide, . 

 56.2 pounds of nitrogen. 



Per cent. 

 19.38 

 12.14 

 7.29 

 2.09 

 2.76 

 1.51 

 1.81 



52 30 



