MANUKES AND FERTILIZERS. 159 



TRADE VALUES OF FERTILIZING INGREDIENTS 

 IN RAW MATERIALS AND CHEMICALS, 1913. 



Adopted by Eastern Experiment Stations for estimating the value of 

 mixed commercial fertilizers. 



Cents 

 Nitrogen — per lb 



in nitrates .^ 18.5 



in ammonia salts 18.5 



Organic Nitrogen — 



in dry and fine-ground fish, meat, and blood 20 



in fine bone and tankage and in mixed fertilizers 19 



in coarse bone and tankage 15 



in cotton seed meal and castor pomace 20 



Phosphoric Acid — 



soluble in water 4.5 



soluble in neutral ammonium-citrate solutij.^. 4 



in dry fine-ground fish, bone, and tankngf 4 ^ 



in coarse fish, bone, tankage, and ashes 3.5 



in cotton-seed meal and castor pomace 4 ' 



in mixed fertilizers, if insoluble in anriionium-citrate 

 solution 2 



Potash — 



as high-grade sulfate, and in forms free from muriate. ... $\ 



as muriate 4I 



in cotton-seed meal and castor pomace S 



The manurial constitutents contained in feeding stuffs may 

 be valued as follows: 



Organic nitrogen 30 



Phosphoric acid 4 



Potash 5 



