CULTIVATION IN DRY AREAS 



151 



places to cut off such weeds as the Canada thistle below 

 the surface, is somewhat heavy of draft. 



The alfalfa cultivator (see p. 317), as the name 

 implies, is specially designed to cultivate alfalfa fields. 

 The round curved and sharp pointed teeth are de- 

 signed to dig into the soil with a view to loosening it 

 for some distance below the surface. The depth to which 

 they penetrate the soil can be adjusted, and it is wholly 

 independent of the weight of the machine. A seeder at- 



THE DEERE CLOD CRUSHER, LEVELLER AND SMOOTHER. 

 Courtesy Deere & Webber Co., Minneapolis, Minn. 



tachment for sowing alfalfa seed may be secured along 

 with the cultivator, which makes it easily practicable to 

 add to the stand of the plants. 



The alfalfa renovator or harrow (see p. 311) is a 

 modification of the ordinary disc, in that it has strong 

 steel spikes projecting from the discs. The Deere alfalfa 

 harrow is of two sizes, 6 and 7 feet long respectively, 

 and it has stationary scrapers to aid in keeping the im- 

 plement free from clogging with trash when in use. 



