CULTIVATION. 211 



of its growth, when the roots require the soil to be 

 pulverized to a considerable depth. 



The cultivator may be considered an improved 

 harrow, the principal difference between them being, 

 that while the teeth of the harrow are pointed at 

 the lower end, those of the cultivator are shaped 

 like a small double plow, being large at the bottom 

 and growing smaller toward the top. They lift 

 the earth up, instead of pressing it downward, thus 

 loosening instead of compacting the soil. 



Many styles of cultivators are now sold at agri- 

 cultural w^arehouses. A very good 'one, for field use, 

 may be made by substituting the cultivator teeth for 

 the spikes in an old harrow frame. 



CHAPTER YI. 



EOLI, ING, MULCHING, WEEDING, ETC. 

 ROLLING. 



Rolling the soil with a large roller, drawn by 

 & team, is in many instances a good accessory to cul- 

 tivation. By its means, the following results are ob- 

 tained : — 



1. The soil at the surface is pulverized without the 

 compacting of the lower parts, the area of contact 

 being large. 



