So. 4.] CHE:\nCAL AND FARM MANURES. 167 



ApPEN"T)IX. 



Fadtors for Use in comparing Guaranties. 

 Frequently, in securing quotations on agricultural chemi- 

 cals and fertilizer stock, one party will guarantee ammonia 

 and another niirogen, some guarantee bone phosphate and 

 others phosphoric acid, and again one may guarantee either 

 sulfate or muriate of potash, while others state the amount 

 of actual potash. In order to compare prices quoted in this 

 manner, the following will be found useful : — 



Multiplying the per cent of ammonia by .82 gives the nitrogen. 



Multiplying the percent of nitrogen by 1.21 gives the ammonia. 



Multiplying the per cent of pure* muriate of potash by .63 gives 

 the actual potash. 



Multiplying the per cent of actual potash by 1..58 gives the pure 

 muriate of potash. 



Multiplying the per cent of pure* sulfate of potash by .54 gives 

 the actual potash. 



Multiplying the per cent of actual potash by 1.85 gives the pure 

 sulfate of potash. 



Multiplying the per cent of bone phosphate by .46 gives the 

 phosphoric acid. 



Multiplying the per cent of phosphoric acid by 2.18 gives the 

 bone phosphate. 



The kinds of chemicals or fertilizer stock that should be 

 used depend upon the character of the soil, the relative cost 

 of the materials and the particular crop to be grown. To 

 assist those who may wish to substitute one kind of material 

 for another without materially affecting the amount of the par- 

 ticular manurial ingredient employed, it is hoped that the 

 following will be found serviceable. Any of the following 

 substitutions may l'>e made without materially changinir the 

 amounts of nitrogen, available phosphoric acid and potash : — 



For 100 pounds of nitrate of soda, either 76 j.x»unds of sul- 

 fate of ammonia. 141 pounds of dried blood or 235 pounds of 

 cotton-seed meal. 



* Ordinary muriate of potash as commonlT sold contains 'but aboni SO ponnds of 

 muriate of potash per hundred, the balance consisting chiefly of common salt; 

 while ordinary high-grade sulfate contains about 90 pounds of sulfate of potash per 

 hundred. 



