204 



Mineral Nutrition of Plants 



barley 

 o— © tomato 

 9— v rice 







8 



10 



12 



14 



Id" 



18 



20 



100 



OXYGEN % 

 Figure 9. Effect of aeration on respiration by abscised roots of barley. Conditions of 

 growth and experiment as in Figures 8A and 8B. — Vlamis and Davis (88) 



a 

 10 y 



15 25 35 



TEMP. IN DEG. C. 



Figure 10. Effect of temperature of the bathing medium 

 on inorganic solute absorption and respiration by abscised 

 barley roots. Plant growth, 5V2 days, dark, in a dilute arti- 

 ficial tap water. Experimental solution 0.005 M KBr -|- 0.0005 

 M CaS0 4 ; time, 8 hours— Ulrich (84) 



