The Bulletin. 5 



valuable constituents of fertilizers — ammonia, phosphoric acid, and 

 potash. These figures, expressing relative value per ton, are not 

 intended to represent crop-producing power, or agricultural value, 

 but are estimates of the commercial value of ammonia, phosphoric 

 acid and potash in the materials supplying them. These values are 

 only approximate (as the costs of fertilizing materials are liable to 

 change, as other commercial products are), but they are believed to 

 fairly represent the cost of making and putting fertilizers on the 

 market. They are based on a careful examination of trade condi- 

 tions, wholesale and retail, and upon quotations of manufacturers. 



Relative value per ton,, or the figures showing this, represents the 

 prices on board the cars at the factory, in retail lots of five tons or 

 less, for cash. 



To make a complete fertilizer the factories have to mix together in 

 proper proportions materials containing ammonia, phosphoric acid 

 and potash. This costs something. Tor this reason it is thought 

 well to have two sets of valuations — one for the raw or unmixed 

 materials, such as acid phosphate, kainit, cotton-seed meal, etc., and 

 one for mixed fertilizers. 



The values used last season were : 



VALUATIONS FOR 1907. 



In Unmixed or Raw Materials. 



For phosphoric acid in acid phosphate 4 cents per pound. 



For phosphoric acid in bone meal, basic slag 



and Peruvian guano 3^ cents per pound. 



Tor ammonia 15 !/2 cents per pound. 



Tor potash 5 cents per pound. 



In Mixed Fertilizers. 



For phosphoric acid 4% cents per pound. 



For ammonia 161^ cents per pound. 



For potash 5y 2 cents per pound. 



HOW RELATIVE VALUE IS CALCULATED. 



In the calculation of relative value it is only necessary to remember 

 that so many per cent means the same number of pounds per hun- 

 dred, and that there are twenty hundred pounds in one ton (2,000 

 pounds). 



