COMMERCIAL FERTILIZERS CONTINUED 2O7 



This fertilizer is evidently a mixture of bone meal 

 and sulphate of potash and the plant food contained 

 in it is as follows: 



Nitrogen 1.65 per cent. 



Available Phosphoric Acid 8 



Insoluble Phosphoric Acid 3 



Potash 10 



One hundred pounds of the mixture would con- 

 tain: 



n j Value per 



Pounds- 100 Ibs. 



Nitrogen 1.64 value at 17 jc.. . .29 



Available Phosphoric Acid 8 " " 40 32 



Insoluble Phosphoric Acid 3 2c 06 



Potash., 10 " " 5c 50 



Total $i-i7 



In one ton the whole value would be twenty times 

 this or $23.40. Add to this $8, which is about the av- 

 erage charge for mixing, bagging, shipping, selling 

 and profit, and we find that $32 is probably the low- 

 est figure at which this fertilizer could be purchased 

 on the markets, and very likely the price would be 

 higher as we have taken the lowest guaranteed per 

 cent, of plant food for our basis of calculation. 



Fertilizers are generally mixed and sold to the 

 farmer on the ton basis. 



LOW GRADE MIXTURES 



Most dealers, to meet a certain demand, furnish 

 mixtures ranging from $15 to $25 per ton. These 

 mixtures are necessarily low grade and are more 



