216 



BOARD OF AGRICULTURE. 



Valuation per two thousand pounds : — 



176.0 pounds of soluble phosphoric acid, 

 14.'2 pounds of reverted phosphoric acid, 

 28.8 pounds of insoluble phosphoric acid, 

 62.4 pounds of nitrogen, .... 



$19 36 



1 14 



1 73 



14 35 



$36 58 

 Standard Superphosphate. 



(Standard Fertilizer Co., Boston, Mass. ; collected of E. N. ■Wood, Lowell, 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.). 



Moisture at 100° C, . 

 Total phosphoric acid, 

 Soluble phosphoric acid, . 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid. 

 Potassium oxide, 

 Nitrogen, .... 

 Insoluble matter, 



Valuation per two thousand pounds : — 



162.6 pounds of soluble phosphoric acid, 

 50.2 pounds of reverted phosphoric acid, 

 18.2 pounds of insoluble phosphoric acid, 



27. pounds of potassium oxide, 



43.4 pounds of nitrogen, 



$34 13 

 Stockbridge Manures, Pease and Beans. 

 (Bowker Fertilizer Co., Boston, Mass.; collected of E. N. Wood, Lowell. Mass.) 



Guaranteed composition : soluble phosphoric acid, 8 to 10 

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

 4 per cent, (equivalent to nitrogen, 2.5 to 3.3 per cent.). 



Per cent. 

 Moisture at 100° C, 17.10 



Total phosphoric acid, 

 Soluble phosphoric acid, . 

 Reverted phosphoric acid, 

 Insoluble phosphoi'ic acid. 

 Potassium oxide, 

 Nitrogen (in organic matter), 

 Nitrogen (in ammonia salts). 

 Nitrogen (in nitrates), 

 Insoluble matter, 



9.62 



6.08 



.84 



2.70 



4.13 



1.60 



.23 



.74 



2.70 



