No. 7. DEPARTMENT OF AGRICULTURE. 



Composition of Non- Acidulated Fertilizer Ingredients. 



676 



(Per Cent.) 



Sulphate of ammonia, 



Nitrate of soda, __ 



Dried blood, - — 



Ground bone, - 



Tankage, - 



Ground fish, - 



Cottonseed meal 



Castor pomace — 



Sulphate, of potash, H. G — 



Muriate of potash, 



Kainit. - 



Double sulphate of potash and magnesia 



9 

 49 

 13 

 71 

 43 

 63 

 260 

 10 

 18 

 42 

 18 



7 



20.06 

 15.39 

 10.82 

 2.91 

 5.95 

 8.05 

 6.94 

 5.06 



50.42 

 51.42 

 13.19 

 27.26 



24.36 



12.70 



7.40 



Composition of Acidulated Fertilizer Ingredients (Per Cent.) 



a 



o 



Dissolved bone, 



Dissolved rock phosphate. 



3 

 41 



13.05 



15.38 



6.25 

 10.35 



4.65 

 3.86 



2.25 

 1.17 



1.93 



Cost per Pound of Fertilizer Constituents. — With the composition 

 of these raw materials and their price per ton, hundred weight, or 

 other unit of measure as a basis, the wholesale cost per pound of 

 the valuable constituents can readily be calculated. In many cases 

 the ammoniates are quoted '*per unit of ammonia," the term unit 

 being equivalent to per cent. ; in goods sold by the ton of 2,000 lbs., 

 the unit is equal to 20 lbs., and 20 lbs. of ammonia contain 16.47 lbs. 

 of nitrogen. 



In the case of refuse bone-black, unacidulated, the mean, 28.25 per 

 cent, of phosphoric acid, is assumed to represent the average ma- 

 terial on the market. 



Phosphate rock is sold by the ton of 2,240 lbs., and on the basis 

 of the bone phosphate of lime it contains, with drawbacks for in- 

 jurious constituents. Bone-phosphate of lime contains 45.8 per 

 cent, of phosphoric acid; therefore, each per cent, of bone phosphate 

 in a long ton is equivalent to 22.4 lbs., and contains 10.26 lbs. of 

 phosphoric acid. 



