CLIMATE AND PLANT GROWTH. 



39 



/3 



-2 



24737 



\ 



\ 



-4 



-2 



QlDtys 





\ 



N 



SIDays 



Oak-Brush Type 



Spruce Fir 



Aspen Fir 



- Temperature above 4OF 



--- Phys/o/oc//cd/ Temper-dfune eff/c/ency 



--- Sum ofc/&//y /Dean 



FIG. 19. Temperature efficiency summations for period of growth of plants used in main 



experiment. 



