VAI^UATION OF FHRTILIZIiRS 1 23 



condition of the soil, tillage, etc. The commercial or trade value 

 only serves as a comparison of the relative values of the different 

 forms of plant food in the raw materials. This valuation does 

 not represent the cost of the mixed goods. In the manufacture 

 of fertilizers the cost of mixing, sacking, dryers, manufacturers' 

 profit, long credits, freight, insurance, agents' profits, etc. are 

 all added to this commercial or trade value, so that the farmer 

 pays much more for plant food than is represented in the com- 

 mercial or trade valuation. But the farmer may purchase the 

 plant food contained in the raw materials (unmixed), for the 

 prices as represented by the commercial or trade values, at those 

 points where the retail prices are quoted. To get the fertilizer 

 to his farm he will of course have to pay freight. 



Trade Values. — The Experiment Stations of Connecticut, New 

 York, Rhode Island, Massachusetts. New Jersey and Vermont 

 make out trade values every year for those materials that are 

 most commonly used in the manufacture of mixed fertilizers. 

 These values are arrived at by calculating the prices of fertilizer 

 materials for the six months preceding March ist. and are ob- 

 tained from the leading markets of southern New England and 

 the middle northern states. 



Trade Values of Fertilizing Ingredients in Raw Materials 

 AND Chemicals for 1909.' 



Cts. per lb. 



Nitrogen in nitrates j6}4 



Nitrogen in ammonia salts 17 



Organic nitrogen in dry and fine ground fish, blood and 



meat and in mixed fertilizers 19 



Organic nitrogen in fine ground bone and tankage 19 



Organic nitrogen in coarse bone and tankage 14 



Phosphoric acid soluble in water 4 



Phosphoric acid soluble in ammonium citrate 31^ 



Phosphoric acid in fine ground bone and tankage 3'^ 



Phosphoric acid in coarse bone and tankage 3 



Phosphoric acid insoluble (in water and in ammonium 



citrate) in mixed fertilizers 2 



Potash as high grade sulphate and in mixtures free 



from muriate f chloride) 5 



Potash as muriate 4^ 



Vermont Experiment Station. 



