COMMERCIAL FERTILIZERS 71 



at an angle of about 45 degrees to the floor. The men 

 stand on either side and shovel the fertilizer up on the 

 screen. The finer particles fall through and the lumps 

 roll to the bottom of the screen, where they can be 

 crushed with the shovels. After the pile has been 

 screened in this manner the screen is set aside and the 

 pile shoveled over twice. When shoveling the bottom of 

 the shovel should be kept on the floor to secure thorough 

 mixing. 



After mixing, the material should be rebagged in con- 

 venient amounts. A common practice is to place 100 

 pounds in each bag. A uniform amount in the bags is 

 necessary to make an even distribution over the field 

 before spreading or drilling. Mixing and rebagging 

 should not cost more than 50 cents a ton. To prevent 

 the forming of hard lumps the mixing should not be done 

 more than a month before applying, especially if chem- 

 icals are largely used. 



