204 SOILS AND FERTILIZERS 



Caustic lime 1 f. ., , , .■  



iT7 j i_ . lL Acid phosphate 



Wood ashes > with < ^. f . \ 

 -„ . , Dissolved bone 



Basic slag 



Cyanamid 

 Caustic lime 

 Wood ashes 

 Basic slag 



with 



' Sulfate of ammonia 

 Slaughter house waste containing ni- 



trogen 

 Farm manure 



The following mixtures should be applied immediately : 



)f Nitrate of soda 

 with < Muriate of potash 

 [ Kainit 

 Acid phosphate with Nitrate of soda or ground limestone. 



Cyanamid should not be mixed with acid phosphate if 

 there is more than one part of the former to ten of the latter. 



259. Calculation of a fertilizer mixture. — In deciding 

 on the composition of fertilizers the best and simplest way 

 is to consider them according to the percentage of each of 

 the three constituents, nitrogen, phosphoric acid and potash, 

 they contain, /if we decide to use a 3-8-5 fertilizer, the 

 next step is to calculate how many pounds of each of the 

 carriers of these substances must be used for each ton of the 

 complete fertilizer, and how much filler must be added. 

 Suppose we have on hand the following carriers : 



Nitrate of soda containing 15 percent nitrogen 



Acid phosphate containing 14 percent available phosphoric acid 



Muriate of potash, containing 50 percent potash 



> The first step is to calculate the number of pounds of 

 nitrogen, of phosphoric acid and of potash in a ton of a 

 3-8-5 fertilizer. To do this we merely multiply the num- 

 ber of pounds in a ton by the percent of each plant-food 

 material. 



