26 



ROOT DEVELOPMENT IN THE GRASSLAND FORMATION. 



like maximum depth of penetration, but can usually be determined for 

 most root systems with a considerable degree of accuracy. While 

 many roots may not reach the working depth of the plant, others usu- 

 ally penetrate beyond. For cereal crop plants (p. 122) the working 



Table 1. — Root depth and surface lateral spread of true prairie species. 



1 In the table, as well as throughout the descriptions, the lateral spread indicates the radial distance to which 

 roots penetrate from the base of the plant. 



