CLIMATE AND PLANT GROWTH. 



57 



21 



/9 



17 



/6 



14- 



13 



12 



10 



Oak Brush 



Aspen 



Dry H/e/qht- (Brorrre-qra&s } 

 Physio/oqica/ Temperature. 

 Efficiency 



FIG. 31. Dry matter produced by one millimeter of leaf length by brome grass and wheat 



(heads included). 



