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 



fZS 



WO 





7S 



SO 



LEGEND 

 ^Densiiy of^ooc/perenn/^/fors^Q 

 ^rass&s percent'. 

 .Annu<9/ prec/p/'-^^Hon inches. 

 .R^f'ni^// Ju//^ ^^^' 'Soc/S&p-/:^ inches. 



— o 



J&/S 



/&/6 



/3I7 



/3/e 



/S/S 



Fig. 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. 



