TILLAGE MACHINERY 



drawn out much as a plow is sharpened. A special form 

 of spading harrow with sharp spikes is used in cultivating 



FIG. 57 A SPADING HARROW 



alfalfa, and is given the name of "alfalfa harrow." The 

 orchard disk differs from the common disk only in that 

 it has an extension frame, so that it may be used to 



FIG. 58 AN ORCHARD DISK HARROW WITH WIDE FRAME TO WORK UNDEP 

 TREES. THE GANGS MAY BE SET TO THROW IN OR OUT 



cultivate rows of small plants as well as to reach under 

 trees and cultivate the soil under the branches. The disk 



