CLIMATE AND PLANT GROWTH. 



57 



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Evaporation . 



Dry we/'qh t (tVnea i ) 



Dry tveiqhf (Bra me. -qra^s ) 



_—_———. Pnys/o/oqica/ Temperature 

 Efficiency 



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



(heads included). 



