APPENDIX. 253 



analyses are given. This information may sometimes be 

 important to farmers and other purchasers. 



RELATIVE COMMERCIAL VALUES. 



After very extended correspondence and careful con- 

 sideration, it has been thought proper to reduce the 

 valuations of ammonia and phosphoric acid from those 

 of last season. The following prices per pound of the 

 valuable ingredients or elements of plant food found in 

 the fertilizers by analysis, have been adopted as a prac- 

 tical approximation to their true value at Savannah, viz: 



Available Phosphoric Acid. 10 cents per pound. 



Ammonia 20 cents per pound. 



Potash 6 cents per pound. 



Last season the valuations were: 



Available Phosphoric Acid 12* cents per pound. 



Ammonia 25 cents per pound. 



Potash o cents per pound. 



It is often desirable to know the relative amounts paid 

 by a farmer for the several valuable ingredients in a ton 

 of fertilizers. The following is a simple rule: Multiply 

 the per centage of ammonia, as given in the tables, by 

 $4.00, the available phosphoric acid by $2.00 and the 

 potash by $1.2, or $1.1-5, and the respective results will 

 show the value of each ingredient in a ton. Thus : Sup- 

 pose a fertilizer analyzes as follows : 



Available Phosphoric Acid 9.27 per cent. 



Ammonia 2.15 per cent. 



Potash 1.85 per cent. 



Then 



9.27 multiplied by 2 . . 

 2.15 " u 4... 

 '1.85 " " 1.2 



Total $29.86 



