Bui. 1227, U. S. Dept. of Agriculture. 



Plate VI. 



Total Protection 



PLOT 



Prairie Dog 

 plot 



Cattle Grazed 

 plot 



Fig. I. — Dropseed (Sporobolus cryptandrus) 

 Clippings Made in Fall at Coconino, Ariz. 



Prairie dogs here had grazed this grass even more closely than had 

 cattle. 



Total Protection 

 plot 



Prairie Dog 

 plot 



Cattle Grazed 

 plot 



Fig. 2.— Fall Clippings of Blue Grama (Boute- 

 loua gracilis) made at williams, ariz. 



The piles labeled "cattle grazed plot" are from the open areas, 

 where both cattle and prairie dogs grazed. 



DROPSEED AND BLUE GRAMA FROM CLIP 

 QUADRATS. 1922. 



