





r 





« 







ir— 



^ .^ ^ 



T— 



160 



















/ ^ 





■p 



















X / 





§140 



- 



















- 



s 



















/ / 





■p 



















/ / 





o 

 o 



















/ / 





u 



















y / 





^ 120 



- 















/ 



y / 



- 



(U 

















/ 



/ 



















/ 



/X 



















/ 



/ 







DO 













y 



/ 



/ 





^ 



M 100 











> 



/ 



/ 









p. 











/ 





/ 



















<^/ 



/ 



/ 











o 









/ 



/ 













1 80 



- 







/ 



/ 











- 











/ / 



/ 







o 



K 



No Aeration 





3 







// 



/ 







A 



ml 



Aeration 





, K, 60 



- 





// 













- 



o 







//2 









O 



NO^ 



No Aeration 





O 

 + ■* 







// 









a 



NO- 



Aeration 





^ 40 



- 





I 











J^ 



- 



<u 







A 













^^^^ 





> 



•H 





// 



















nJ 























i-H 



















^^,^^^ ^^ 





3 























1 20 



r"» 















^^ 





- 



u 















^^ 



^JCT 

















^ 



^^ 























^^ 







































^^v*^ 





















^jcy 



tS-- 



• "^ 



















^ 



^=^^ 



-^J 









„j_ 



1 \ 



_J 1 



12 



16 



20 



24 



Hours 



Figure 26. Experiment 3. Effect of aeration on ammonium 

 uptake from 0.5-mM NH.Cl and on nitrate uptake 

 from 0.5-mM KNO^. 



51 



