CLIMATE AND PLANT GROWTH. 



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Oak-Brush ~Fype 

 Wheat 



Aspen-* Fir 



Spruce -Fir 



Including tieac/i 



_. .—Wheat Without Heads 



Wa 



I Per 



Water Used 

 Plant 



Water Requirement without heads expressed m 



percent of wafe'r requirement with heads 



Temperature above 4€°F. 



Fig. 25. — Water requirement of wheat based on weight of plant including heads, compared 

 with water requirement based on weight without heads, (Experimental Series No. 2.) 



