182 Fertilizers 



nitrogen 15 cents a pound. That is, the $48 a ton, or 15 

 cents a pound, represents the retail cost a pound of nitrate 

 nitrogen. This, if applied to the nitrogen as nitrate, in 

 the mixed fertilizer, will show what it could have been 

 bought for as nitrate in the unmixed fertilizer. The 

 values for the other constituents are derived in the same 

 way. These, together, make the schedule of trade or com- 

 mercial values of the constituents which are used in the 

 computing of the commercial values of mixed fertilizers. 

 The schedule of values is revised annually, and, as nearly 

 as possible, at the same time in the year. The following 

 schedule, used as an illustration of this point, was adopted 

 by the Directors and Chemists of the Experiment Stations 

 of New Jersey and the New England states for use in that 

 territory for the year 1914 : 



SCHEDULE OP TRADE VALUES Cents 



per pound 



Nitrogen in nitrates 16.5 



Nitrogen in ammonia salts 16.5 



Organic nitrogen in fine * ground fish, meat and blood . 22.5 



Organic nitrogen in cotton-seed meal and castor pomace 22.5 



Organic nitrogen in fine x bone and tankage 21.5 



Organic nitrogen in mixed fertilizers 19.5 



Organic nitrogen in coarse 1 bone and tankage .... 17.5 



Phosphoric acid, soluble in water 4.5 



Phosphoric acid, soluble in ammonium citrate .... 4.0 



Phosphoric acid in fine x bone and tankage 4.0 



Phosphoric acid in cotton-seed meal and castor pomace 4.0 



Phosphoric acid in coarse 1 bone, tankage and ashes . . 3.5 

 Phosphoric acid, insoluble in water and in ammonium 



citrate 2.0 



Potash in high-grade sulf ate, and in the forms free from 



muriate (chlorids) 5.0 



Potash in muriate 4.0 



Potash in cotton-seed meal and castor pomace ... 5.0 



1 "Fine" signifies such as will pass through a sieve with 

 circular holes ds of an inch in diameter, and "coarse" such as 

 will not. 



