DEPTH OF ROOT SYSTEMS 87 
On deeper and somewhat drier soils, corn roots 
went down as far as eight feet. The roots of the 
Avy 
4 
Fig. 24. Sugar-beet roots. 
small grains, — wheat, oats, barley, — penetrated 
the soil from four to eight or ten feet. Vari- 
ous perennial grasses rooted to a depth of four feet 
the first year; the next year, five and one half feet; 
