64 



The Bulletin. 



pounds of phosphoric acid and 8 pounds each of nitrogen and potash, 

 it is only necessary to divide the number of pounds of plant food 

 desired per acre (40, 8, and 8) by the percentage composition of the 

 materials to be used, as follows : 



The best and most economical way to apply this fertilizer is in the 

 drill before planting, though there is no objection to dividing the 

 application into two parts, putting one-half in the drill before plant- 

 ing and applying the other half as a side dressing around July first, 

 according to season and growth of crop. It is certain that quanti- 

 ties of 400 pounds and less of fertilizer should not be applied broad- 

 cast. 



