24 
Colorado Experiment Station 
The effects of grazing upon the vegetation of ditch banks 
are strikingly shown where one side or section of a ditch is 
grazed and the other side or adjacent section is nngrazed. 
PTgure 5 graphically illustrates this. 
It is not unusual to see grazed ditch hanks grown over with 
a fair stand of grasses, chiefly Kentucky blue grass. Contin- 
ued grazing results in rapid reduction of annuals, and a pro- 
portionate increase of perennials. 
Fig. 6 — Small lateral ditch bank densely overgrown with smooth hrome grass. 
This grass occupies the ground to the almost total exclusion of weeds. 
SEEDING OF DITCH BANKS 
Phgure 6 shows a small lateral ditch bank on the Agricul- 
tural College campus densely overgrown with smooth brome 
grass (Bronius inermis). This perennial almost entirely ex- 
cludes all weed growth. Its more general use on ditch banks 
should be encouraged. An excellent quality of seed is ob- 
tainable. 
The writers acknowledge the assistance of Miss Caroline 
M. Preston, who made the drawing for Figure 1, and of Mr. 
George Spidel, who collected and analyzed many of the 
samples. 
