282 ILLINOIS STATE DAIRYMEN'S ASSOCIATION 



duce an increase in production. (See Bill. No. 150 of this 

 Station). 



Valuation of Fertilizers. 



The cost of commercial fertilizers in the market is gov- 

 erned by law of supply and demand, as is that of all other 

 commodities. Raw materials and chemicals containing one or 

 two fertilizing ingredients furnish data for the calculation of 

 the average cost of these ingredients in commercial fertilizers. 

 Since the prices of the different fertilizing materials vary some- 

 what from time to time according to the condition of the mar- 

 ket, the calculations must be revised at intervals. The average 

 retail prices of raw materials and chemicals in the large eastern 

 fertilizer markets for the six months preceding March each 

 year are calculated by a number of eastern experiment stations, 

 and the cost of the different fertilizing ingredients which com- 

 mercial fertilizers on the market contain, is obtained on the 

 basis of these figures; these values correspond approximately 

 to the prices of fertilizing materials in our main fertilizer 

 markets, and may be used for the purpose of comparing the 

 value of the various commercial fertilizers offered for sale in 

 this state. 



The trade values of fertilizing ingredients in raw materials 

 and chemicals adopted for the present year are given in the 

 following schedule : 



NITROGEN— Cents per lb. 



in nitrate salts 18.3 



in ammonia salts 17.5 



ORGANIC NITROGEN— 



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

 grade mixed fertilizers 20.5 



in fine bone and tankage 20.5 



in coarse bone .and tankage 15 



PHOSPHORIC ACID— 



soluble in water 5 



soluble in ammonium-citrate solution 4.5 



in dry fine-ground fish, bone and tankage 4 



in coarse fish, bone and tankage 3 



in cottonseed meal, linseed meal, castor pomace, and wood 



ashes 4 



insoluble (in ammonium-citrate solution) in mixed fertil- 

 izers 2 



