1903.] 



PUBLIC DOCUMENT — No. 33. 



11 



not suflered where a discrepancy has occurred between the 

 results of analysis and the manufacturer's guarantee. This 

 Avould indicate that it was the manufacturer's aim to furnish 

 an article fully equal to his guarantee of composition, and, 

 where a difference has occurred between the analysis and 

 guarantee, that poor mixing is responsible for the discrep- 

 uncy. It is self-evident that those fertilizers should be 

 selected for general use which furnish the greatest amount 

 of nitrogen, potash and phosphoric acid, in a suitable and 

 available form, for the same money. 



Trade Values of Fertilizing Ingredients in Raio Materials and 

 Chemicals, 1901 and 1902 (Cents per Pound). 



1901. 



1903. 



Nitrogen in ammonia salts, 



Nitrogen in nitrates, 



Organic nitrogen in dry and fine-ground fish, meat, blood and in high- 

 grade mixed fertilizers. 

 Organic nitrogen in fine bone and tankage 



Organic nitrogen in medium bone and tankage, ..... 



Phosphoric acid soluble in water, 



Phosphoric acid soluble in ammonium citrate 



Phosplioric acid in fine-ground flah, bone and tankage, .... 



Phosphoric acid in cotton-seed meal, castor pomace and wood ashes, . 



Phosphoric acid in coarse flsb, bone and tankage 



Phosphoric acid insoluble (in water and in anmioiiium citrate) in mi xei 1 



fertilizers. 

 Potash as sulfate (free from chlorides), 



Potash as muriate, 



16.50 



14.00 



16.00 



16.00 



12.00 



5.00 



4.50 



4.00 



4.00 



3.00 



2.00 



5.00 



4.35 



16.50 

 15.00 

 16.50 

 16.00 

 12.00 

 5.00 

 4.50 

 4.00 

 4.00 

 3.00 

 2.00 

 5.00 

 4.25 



A comparison of the above trade values for 1901 and 

 1902 shows that the market cost of the different essential 

 elements of plant food remains the same as in 1901, with 

 the exception of nitrogen in form of nitrates and the higher 

 grades of organic nitrogenous fertilizing materials, which 

 show a somewhat higher cost, as compared with the pre- 

 vious year. 



The trade values of fertilizing ingredients in raw materials 

 and chemicals are based on the market cost, during the six 

 months preceding March, 1902, of standard raw materials 



