RANGE AND CATTLE MANAGEMENT DURING DROUGHT. 21 
ciation, amounting to 40.5 per cent, is believed to be approximately 
representative of the average depreciation of grama-grass range on 
FLETVTECEWN 72 
INCHES 
LEGEND 
—DLensity of g00d perennial forage 
EIASSES percent. 
——Annual precipl/tation inches 
| |---- a n7e// July, Aug. and Sept, ey ee 
45 WE LHA7 WAS (HP 
Wig. 5.—Density of good perennial forage grasses, on protected grama-grass range com- 
pared with annual and seasonal precipitation at the reserve. 
the Jornada Range Reserve due to drought, although there is con- 
siderable variation. Plate II shows how this grass was killed out. 
