218 



BOARD OF AGRICULTURE. 



Per cent- 

 Potassium oxide, 3.44 



Nitrogen, 2.44 



Insoluble matter, . . .- 6.60 



Valuation per two thousand pounds : 



146.8 pounds of soluble phosphoric acid, 

 7.8 pounds of reverted phosphoric acid, 

 61.4 pounds of insoluble phosphoric acid, 

 68.8 pounds of potassium oxide, . 

 48.8 pounds of nitrogen. 



Standard Superphosjjhaie. 



$34 59 



(Standard Fertilizer Co., Boston, Mass. ; collected of A. B. Lawrence, Fitchburg,. 



Mass.) 



Guaranteed composition : total phosphoric acid, 9 to 14 

 per cent. ; potassium oxide, 1 to 3 per cent. ; ammonia, 2 to 

 4 per cent, (equivalent to nitrogen, 1.6 to 3.3 per cent.). 



Per cent. 

 18.08 

 13.32 

 7.07 

 3.80 

 2.46 

 1.43 

 1.11 

 1.49 



Moisture at 100° C, . 

 Total phosphoric acid. 

 Soluble phosphoric acid, . 

 Reverted phosphoric acid. 

 Insoluble phosphoric acid. 

 Potassium oxide, 

 Nitrogen (in organic matter), 

 Nitrogen (in nitrates). 



Valuation per two thousand pounds : — 



111. 4 pounds of soluble phosphoric acid, 

 76. pounds of reverted phosphoric acid, 

 49 2 pounds of insoluble phosphoric acid, 

 28.6 pounds of potassium oxide, . 

 22 2 pounds of nitrogen (in organic matter,) 

 29.8 pounds of nitrogen (in nitrates) , . 



$36 87 



Bowker''s Grass Top Dressing, Forage Crops. 

 (Collected of J. C. Wright, Fitchburg, Mass.) 



Guaranteed composition : total phosphoric acid, 6 to 8 per 

 cent. ; soluble and reverted phosphoric acid (available) , 5 



