CLIMATE AND PLANT GROWTH. 



59 



Osk-br-ush 



Aspen 



Sprue e-F/'r* 



Evaporation 



Temperature a bo ve 4-O ~ 



/ll/ersge stem fengfh 



Dry weight per p/ant 



L eaf length 



l/Vafer used per plant 



PIG. 32. Comparison between climatic factors and the growth of wheat. 



