CLIMATE AND PLANT GROWTH. 



11 



36S 

 358 

 3.0 



279 



S/ 



PEAS 



WHEAT 



BftOME 



Water requirement per unit of dry 



rnatter of aeria/ parts- 

 Water requirement of a eria/ and 



subterranean parts combined 

 Proportion of roots to tops, perceni- 



FIG. 3. Water requirement of aerial and subterranean parts of peas, wheat, arid brome 

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



