SOILS AND FERTILIZERS 77 



Tillage Implements. The spade, the hoe, and the 

 rake are the principal tillage implements for small 

 tracts or small garden plots, but for the farm or the large 

 garden, implements worked otherwise than by hand are 

 used. Horses and oxen have furnished the power for 

 farm tillage for many centuries, but now these animals 

 are often superseded by steam or gas engines. 



The Plow. One of the most ancient of farm im- 

 plements is the plow. At first a crooked stick drawn 

 by a slave or by cattle, it has developed into the per- 

 fectly formed steel plow often pulled in groups or 

 gangs by large steam or gas engines. The plow as we 

 ordinarily think of it is the moldboard plow. There 

 are many types of this plow, depending on the special 

 use to which the plow is placed. The general purpose 



MOLDBOARD 

 SHARE 



POINT 



BEAM 



FIG. 16. General Purpose Plow.i 



plow which is shown here might be used for all kinds of 

 work if other forms were not available. 



The breaking plow has a much longer moldboard 



J The part of the plow on the other side of the share receiving the 

 pressure when the furrow is turned is called the landside. It is not 

 shown in the illustration. 



