Of the ten substances which compose the above 

 100 per cent, only three are of interest to the farmer. 

 The value of the whole ton is based on the value of 

 the nitrogen, phosphoric acid, and potash, only. 



In raw bone, for example, it is impossible to give 

 a farmer the 3% nitrogen and the 24% phosphoric 

 acid contained without giving him the 73% of lime, 

 gelatines and fats, etc., found in bone, for these sub- 

 stances are in combination and the process of separ- 

 ation would be too costly. 



HOW TO UNDERSTAND A FERTILIZER ANALYSIS. 



Manufacturers often state the analysis of their 

 fertilizers in a confusing way. They use two terms 

 to express the same thing. Nitrogen and ammonia 

 both mean one thing, and the analysis should read, 

 for example, "nitrogen 4.95% equal to ammonia 

 6%," showing that there is not both the 4.95%, and 

 the 6%, but only one or the other. That the one 

 repeats the other. Multiply the percentage of am 

 monia by .825 and the result will be the equivalent 

 in nitrogen, as for example, 6% ammonia X .825= 

 4.95% nitrogen. It takes 4.95% nitrogen to equal 

 6% ammonia. In figuring the value of a ton in 

 dollars and cents, nitrogen from blood or nitrate of 

 soda has a market value of 16 cents per pound, while 

 its equivalent in ammonia is worth only 13% cents 

 per pound. Only one should be included in the 

 estimate. 



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