GRASS CULTURE AND RANGE IMPROVEMENT 3 



abandonment and many became fully covered with good grass during 

 the periods indicated, none of the fields repossessed a cover compara- 

 ble in composition with the disclimax vegetation present on adjacent 



Figure 1. — Charting vegetation on a field near Akron, Colo., that had been culti- 

 vated 6 years, abandoned 43 years, and heavily grazed : A, View showing 

 persistence of tufted red three-awn (triple-awn) ; B, close-up showing typical 

 mat of ringgrass, an indicator of close grazing or other disturbance. 



