320 



BOARD OF AGRICULTURE. 



soluble phosphoric acid, 1 to 2 per cent. ; potassium oxide, 

 2 to 3 per cent, (equivalent to sulphate of potash, 4 to G 

 per cent.). 



Moisture at 100° C, 

 Total phosphoric acid, 

 Soluble phosphoric acid, . 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide, 

 Nitrogen, .... 

 Insoluble matter, 



Per cent. 

 12.40 

 11.08 

 6.66 

 2.79 

 2.63 

 2.93 

 2.49 

 4.63 



Valuation per two thousand pounds : - 



113.2 pounds of soluble phosphoric acid, 

 55.8 pounds of reverted phosphoric acid, 

 62.6 pounds of insoluble phosphoric acid, 

 68.6 pounds of potassium oxide, . 

 49.8 pounds of nitrogen, 



?11 32 

 6 02 

 2 37 

 4 25 

 9 96 



$32 92 



Bradley'^s XL Superphosphate of Lime. 

 (Collected of J. & J. A. Rice, "Worcester, Mass.) 



Guaranteed composition : Nitrogen, 2\ to 3| per cent. ; 

 total phosphoric acid, 11 to 14 percent. ; soluble phosphoric 

 acid, 7 to 8 per cent. ; reverted phosphoric acid, 2 to 3 per 

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

 oxide, 2 to 3 per cent. 



Per cent. 



15.09 



13.38 



Moisture at 100° C, 

 Total phosphoric acid, 

 Soluble phosphoric acid, . 

 Reverted phosphoric acid. 

 Insoluble phosphoric acid. 

 Nitrogen (in organic matter), 

 Nitrogen (in ammonia salts), 

 Potassium oxide, 

 Insoluble matter, 



8.85 

 2.73 

 1.80 

 2.08 

 .51 

 1.89 

 5.24 



Valuation per two thousand pounds : 



177. pounds of soluble phosphoric acid, 

 54.6 pounds of reverted phosphoric acid, 

 36. pounds of insoluble phosphoric acid, 



$17 70 

 4 91 

 1 62 



