Water Requirements 



133 



in the West, and the introduction of these varieties has 

 greatly increased crop production and the possibilities of 



FIG. 43. Semiarid sandhills of eastern Colorado ; Andropogon scoparius 

 (bunch grass) and Bouteloua hirsuta. [Photograph by H. L. Shantz.] 



agriculture. These wheats are apparently adjusted struc- 

 turally to absorb more water, by increased root develop- 

 ment, and to conserve it better, by lessened transpiration. 



