74 Gardening 



(3) A pound of potassium sulfate is 54 per cent potash. How 

 many pounds of potassium sulfate are needed to supply the potash 

 required ? 



(4) Add the three amounts (or the amounts nearest the next 

 even number for any that are not even). If the total is less than 

 100 pounds, the difference indicates the amount of dry sand or 

 earth that is to be included in the mixture. 



D. Is it possible to make a mixture of sodium nitrate, acid 

 phosphate, and potassium sulfate that will contain 8 per cent 

 nitrogen, 10 per cent phosphoric acid, and 15 per cent potash? 

 (Work out this problem, basing your calculation on the facts 

 learned in the previous problems. Determine the amount neces- 

 sary for each ingredient.) 



