no 



HATCH EXPERIMENT STATION. 



[Jan. 



Trade Values of Fertilizing Ingredients in Raio Materials and 

 Chemicals, 1897 and 1898 {Gents per Pound). 



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 cotton-seed meal, . 

 Organic nitrogen in fine bone and tankage, . 

 Organic nitrogen in medium bone and tankage, . 

 Phosjihoric acid soluble in water, .... 

 Phosphoric acid soluble in ammonium citrate, 

 Phosphoric acid in fine bone and tankage, . 

 Phosphoric acid in cotton-seed meal, castor pomace, 



ashes and fine-ground fish, .... 



Phosphoric acid in coarse bone and tankage. 

 Phosphoric acid insoluble (in ammonium citrate) in mixed 



fertilizers, 



Potash as sulphate (free from chlorides), 

 Potash as muriate, 



wood 



1897. 



13.5 

 14.0 



14.0 



12.0 



13.5 



11.0 



5.5 



5.0 



5.0 



5.0 

 2.5 



2.0 

 5.0 

 4.5 



189S. 



14.0 

 13.0 



14.0 

 12.0 

 13.5 



10.0 

 4.5 

 4.0 

 4.0 



4.0 

 3.5 



2.0 

 5.0 

 4.25 



From these figures it is apparent that some of the best 

 forms of nitrogen and phosphoric acid have suftered, as a 

 rule, a reduction in cost, as compared with preceding years. 



For further details I have to refer to preceding annual 

 reports. 



Consumers of cotnmercial manurial substances will do ivell 

 to buy, whenever practicable, on a guarantee of comjjosition 

 of their essential constituents, and to see that the bill of sale 

 recognizes the point of the bargain. Anij mistake or mis- 

 understanding in the transaction may be readily adjusted, in 

 that case, between the contending parties. 



The responsibility of the dealer ends with furnishing an 

 article corresponding in its composition with the lowest 

 stated quantity of each specified essential constituent. 



It is of the first importance, when buying fertilizers for 

 home composition, to consider their cost Avith reference to 

 what they promise to furnish. 



