CHAPTER XIII. 



VALUATION OF FERTILIZERS. 



Interpretation of Chemical Analyses. — -\ chemical analysis of a 

 fertilizer may indicate to a great extent the value or suitability 

 of it. The following two analyses illustrate this point. 

 Chemical Analysis, No. i. 



Per cent. 



Nitrogen as nitrate i .00 



Nitrogen as ammonia i . 00 



Organic nitrogen 2.00 



Total nitrogen 4.00 



Water soluble phosphoric acid 8.00 



Reverted phosphoric acid 2.00 



Insoluble phosphoric acid 2.00 



Available phosphoric acid 10.00 



Total potash 9.00 



Potash as chloride 2.00 



Potash as sulphate 7.00 



Chemical Analysis, No. 2. 



Per cent. 



Nitrogen as nitrate 



Nitrogen as ammonia 



Organic nitrogen 4.00 



Total nitrogen 4.00 



Water soluble phosphonc acid 2.00 



Reverted phosphoric acid 8.00 



Insoluble phosphoric acid 2.00 



Available phosphoric acid 10.00 



Total potash 9.00 



Potash as chloride 8.00 



Potash as sulphate i .00 



Both of the above fertilizers contain equal amounts of nitrogen, 

 phosphoric acid and potash and could be stated as follows: 



Per cent. 



Nitrogen 4.00 



Available phosphoric acid 10.00 



Potash 9.00 



Fertilizer No. i contains nitrogen as nitrates and as ammonia 

 while Xo. 2 does not. Both brands contain organic nitrogen ; 

 9 



