228 Relations between Growth and Environment 



Age in Weeks 



Fig. 7. Mean relative rate of increase at each age, with regression lines 

 for young and old plants. 





M 



Age in Weeks 



Fig. 8. Mean relative rate of increase at each age TMean Maximum Temperature — 67" F. 

 reduced to standard conditions, with regres- . Mean Minimum Temperature — 46° F. 

 sion lines for young and old plants. I Bright Sunshine — 21 hours. 



