314 Bureau of Farmers' Institutes. 



Example: What is the valuation of one ton of a commercial 

 fertilizer having the following guarantee analysis? 



Per cent. 



Nitrogen 2 (to 3) 



Available phosphoric acid 8 (to 10) 



Potash 3 (to 5) 



In each case where a guarantee analysis gives two figures, 

 always use the lower, because the law takes only the lower guar- 

 antee into consideration. 



Cents. 



Two (per cent, nitrogen) x 14 cents (price of one pound 



nitrogen) = 0.28 



Eight (per cent. av. phos. acid) x 5 cents (price of one pound 



av. phos. acid) = 0.40 



Three (per cent, potash) x 5 cents (price of one pound pot- 

 ash) = .' , 0.15 



Total value of 100 pounds of fertilizers = 0.83 



0.83 cents x 20 = $10.60 a ton. 



When the nitrogen is given only in the form of ammonia, first 

 change to equivalent of nitrogen (see (1), page 311) and then 

 follow above rule. 



When the phosphoric is given only in the form of bone phos- 

 phate of lime, first change to equivalent of phosphoric acid (see 

 (c) (15), page 311) and then follow above rule. 



When the potash is given only in the form of sulphate or 

 muriate, first change to equivalent of actual potash (see (0) and 

 (11), page 311) and then follow rule. 



4. How to Calculate Amounts of Materials to be Used in 

 Making a Home-Made Fertilizes. 



There will probably be little demand for information in regard 

 to quantities of different materials to be used in making home- 

 mode fertilizers, since the subject is treated in a specific manner 

 on pages 283-301. But it will, at least, be of interest to learn 



