PLOWS FOR DRY-FARMING 



307 



The disk plow has recently come into prominent 

 use throughout the land. It consists, as is well 

 known, of one or more large disks which are believed 



Fig. 75. Plow bottoms. 



to cause a smaller draft, as they cut into the ground, 

 than the draft due to the sliding friction upon the 

 moldboard. Davidson and Chase say, however, 

 that the draft of a disk plow is often heavier in propor- 

 tion to the work done and the plow itself is more 



Fig. 76. Plow with interchangeable moldboard and share. 



clumsy than the moldboard j^low. For ordinary dry- 

 farm purposes the disk plow has no advantage over 

 the modern moldboard plow. Many of the dry-farm 

 soils are of a heavy clay and become very sticky dur- 

 ing certain seasons of the year. In such soils the disk 

 plow is very useful. It is also true that dry-farm 



