236 SOILS AND FERTILIZERS 



A more concentrated fertilizer could be prepared by 

 using high-grade sulphate of potash, superphosphate, 

 and ammonium sulphate. A fertilizer composed of 

 these ingredients would contain : 



b. 



O 



w z 



O O K 



H w 

 h t- N 



Z t/3 "! 



w o - 



i s c2 



POUNDS PER CENT ToTAL VALUE 3 o w 



L.BS. 



300 Sulphate of ammonia 20 N 60 @ 16 cents = $ 9.60 3.00 



500 Sulphate of potash . 50 K 2 O 250 5 cents = 12.50 12.50 



1 200 Superphosphate . . 35 P 2 O 5 420 @ 7 cents = 29.40 21.00 



Total $51.50 



So concentrated a fertilizer as the preceding is rarely, 

 if ever, found on the market, although the price, $51.50 

 per ton, is frequently charged. This example shows 

 the composition and cost of the ingredients in one 

 of the most concentrated fertilizers that can be pro- 

 duced. 



The market value of the materials of which commer- 

 cial fertilizers are made fluctuates like that of other com- 

 modities. 



Any of the different materials mentioned in the 

 chapters on special fertilizers can be used in making 

 commercial fertilizers, as dried blood, tankage, nitrate 

 of soda, sulphate of ammonia, raw bone, dissolved 

 bone, raw phosphate rock, dissolved phosphate rock, 

 basic slag, kainit, muriate or sulphate of potash, and 

 many others. Inasmuch as each of these materials 

 has a different value, it follows that fertilizers, even 



