T. C. Broyer 



203 



D. 

 < 



CO 



Q 

 Ld 

 CO 

 CO 



UJ i- 

 Or $L 



o_ — 



? J 



z S 

 F * 



z 



Ld 



u 



z 

 o 



e 



barley 

 0—0 fomato 

 7—9 rice 



cv control value 



8 



10 12 14 



OXYGEN 7. 



18 



20 



100 



100 



OXYGEN % 



Figures 8A and 8B. Effect of aeration on salt accumulation by abscised roots of barley. 

 Plants 4 weeks old; abscised roots in experimental culture solution (KBr, 5 milliequivalents 

 per liter) for 24 hours. Above: potassium absorption; Below: bromide absorption. — Vlamis 

 and Davis (88) 



