CLIMATE AND PLANT GROWTH. 



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D/^y yve/qht (fVheai ) 



Dt^y tveit^ht (Brome -q/^ass ) 



■ Physio/oq/ca/ Tempet'ature- 

 Efficiency 



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



(heads included). 



