THE TILLAGE OF SOILS 



41 



crops. The work of seeding generally stirs or tills the 

 soil to a considerable extent. A small furrow is usually 

 opened by the drill shoe, or the planter blade ; and the 

 dirt is filled in again over the seed by some shovel or 

 wheel attachment behind. 



Fig. 12 



- Farmer harrowing 



29. Destroying Weeds. — One of the primary objects 

 of tillage is to destroy weeds. The tool which is used 

 depends upon how deeply or thoroughly we wish to cul- 

 tivate the soil, in addition to killing the weeds; and it 



