484 



THE PRINCIPLES OF SOIL MANAGEMENT 



cultivators proper and harrows. They are much used 

 for the intertillage of young crops. 



The Acme harrow consists of a series of twisted 

 blades which cut the soil and work it over. They are 

 most useful in the latter stages of pulverization on soil 

 relatively free from stone. The Meeker harrow is a 



Fig. 143. Stubble digger used to fit light, mellow soils for seeding. 



modified form of disc, used primarily for pulverization. 

 It consists of a series of lines of small discs arranged 

 on straight axles, and is especially adapted to breaking 

 up hard, lumpy soil. In this particular, it may be con- 

 sidered to belong to the third set of implements, the 

 clod crushers. But, as compared with the roller on hard 

 soil, it is more efficient. 



342. Seeder cultivators. Many implements used 



