118 ROOT DEVELOPMENT IN THE GRASSLAND FORMATION. 



The stand was thick, the plants averaged about 2.5 feet in height, and 

 promised a good yield. At the time of this investigation the crop had 

 been harvested. The surface 2.2 feet of Pierre clay was much drier 

 than in the field of wheat. At this depth there was a layer of coarse 



Fig. 34. — Hoot system of Secale cereale grown in sandy soil. 



sand intermixed with pebbles and some small rocks. It soon gave way 

 to gravelly soil intermixed with somewhat alternating streaks of sand 

 and clay. The yellowish-brown sand was quite dry, but the underlying 



