16 VEGETABLE GROWING. 



First Formula. 



200 pounds phosphoric acid, lOc $20 00 



160 pounds potash, 6c !. 9 60 



120 pounds nitrogen, 12c, ' 14 40 



Total $44 00 



Second Formula. 



120 pounds phosphoric acid, lOc $12 00 



120 pounds potash, 6c 7 20 



80 pounds nitrogen, 12c 9 60 



Total $28 80 



This shows that the former fertilizer is worth $15.20 

 more per ton than the latter, but suppose that the lat- 

 ter fertilizer were offered you at the depot for $26, 

 then it is necessary to decide whether you make any- 

 thing by buying the cheaper and have the extra haul- 

 ing and handling. There is still another point to be 

 considered : if the latter fertilizer costs $28.80 per ton, 

 a pound will cost $.0144; $44 (the price of the former) 

 will buy 3,055 pounds. Of this, 183i pounds (6 per 

 cent, of 3,055 pounds) are phosphoric acid, 183:1 

 pounds are potash, and 122J pounds nitrogen. If the 

 latter formula is chosen at the price ($28.80) given for 

 its value, one obtains 161 pounds phosphoric acid less, 

 23 J pounds potash more, and 2i pounds nitrogen more 

 for the same money than by buying the former. 



