New York Agricultural Experiment Station. 135 



pound of nitrogen in the form of ammonia (see price list on page 

 132.) Multiply tliis product by 20. '' 



Example : A sample of ammonium sulphate tests 24 per cent, 

 ammonia ; what is its commercial valuation ? 



24 (per cent, of ammonia) X 0.82 = 19.68 per cent, of nitrogen. 



19.68 X IS^ cents = 364 cents, value of nitrogen in 100 lbs. of 

 ammonium sulphate. 



364 cents x 20 = $72.80, value of nitrogen in one ton of am- 

 monium sulphate. 



(2) Nitrate of Soda. Rule. Multiply the test per cent, of 

 nitrate of soda by 16^ and this product by the price of one pound of 

 nitrogen in the form of nitrates (see price-list on page 132). 

 Multiply the last result by 20. 



Example ; What is the valuation of one ton of nitrate of soda 

 which tests 98 per cent. ? 



" Nitrate of soda testing 98 per cent." means that in every 100 

 pounds of material there are 98 pounds of pure nitrate of soda. 



0.98 X 16^ = 16. lY per cent, nitrogen in nitrate of soda. 



16.17 X 15 cents = 242|- cents x 20 = $48.50 a ton. 



When the per cent, of nitrogen is given, then the first step is 

 omitted. 



(b) Materials Containing Phosphoric Acid. 



Ride. Multiply the given amount of available phosphoric acid 

 by the price of one pound of soluble phosphoric acid (see price-list 

 on page 132) and the result by 20. 



If the amount of insoluble phosphoric acid is given, multiply this 

 by 40 and add to foregoing amount. 



Example : AVhat is the commercial valuation of one ton of dis- 

 solved bone-black testing 16 per cent, of available phosphoric acid ? 



16 X 6 cents = 96 cents x 20 = $19.20 a ton. 



If this sample were known also to contain 2 per cent, of insoluble 

 phosphoric acid, then 



2 X 40 cents = 80 cents and $19.20 + 0.80 = $20. 



(c) Materials Contahmuj Potash. 



(1) Sulphate of Potash. Rule. Multiply the test per cent, 

 sulphate of potash by 0.54 and the product by the price of one 

 pound of potash in the form of sulphate (see price-list on page 132). 

 Multiply this product by 20. 



