CLIMATE AND PLANT GROWTH. 



51 



recorded in the spruce-fir type, while in the central type the physio- 

 logical temperature efficiency was intermediate. Since a habitat with 

 low-growing temperatures requires a greater number of clays for the 







/ 



88 



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64 Days 









s 

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1007 



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988 





980 



43 



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64 















56.0 



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5/.0 











Oak-Brush Type 



spen - r/r 



3 P 



-Fi\ 



¥ 



race -r/r 



-F» 



, Days For Appearance Of Heads 



Temperature. Above 40 F. 



Averaoe Daily Mean Temperature 



Fig. 27. — Relation of temperature to time of first appearance of blossoms in peas. 



plant to reach a given stage of maturity than a warmer situation, it 

 is evident that the physiological temperature indices would be in in- 

 verse ratio to the time required to bring the plant to a given stage of 

 maturity. 



