CLIMATE AXD PLAXT GEOWTH. 



11 



Zl.3 



I 



4- 



S/€ 



363 

 358 

 3.0 



T3 



w 



279 



PE/iS 



WHEAT 



BftOME 



1 Wafer requirem en t per unit o f dry 



matter of aeriai parts 

 ■ Water requirem en t of aeriaf and 



subterranean parts combined 

 Proportion of roofs to tops , percenf 



Fig. 3. — Water requirement of aerial and subterranean parts of peas, wheat, and brome 

 grass, compared with the ratio of roots to aerial portion. 



