action, is used, there is much less actual loss during 

 a season, and its effect is more sure and lasting. Yet 

 there are times when a quick-acting fertilizer is 

 needed. This would then be the most economical 

 form. It depends upon the needs at the time, and 

 the farmer should know enough about the nature of 

 the different forms of plant food to exercise judgment 

 in the selection. 



GENERAL PURCHASING PRINCIPLES. 



1. The market value of every brand depends 

 upon the amount, or percentage, of plant food con- 

 tained. The nitrogen, phosphoric acid and potash each 

 have their own market value per pound, and these 

 must be known to the grower in order to purchase 

 economically. 



2. Be sure the food elements are of proper 

 source and form to be available as fast as wanted 

 by the trees. 



3. Purchase high grade materials. 



EXAMPLE OF FERTILIZER WORTH $5.30 PER TON. 



Fresh water mud, 2000 pounds, contains: 



30 pounds nitrogen (V/2%) at 16c $4.80 



4J/2 pounds phosphoric acid (.23% ) at 5Vc 23 



4% pounds potash (.23%) at 6c 27 



$5.30 



