94 



PHYSIOLOGICAL ACTIVITIES 



Nuclei'fi of plant 

 cells 



Decomi>osit'ion 

 ■^bacihria 



Unknown ^^3 

 2\ oxidizes 



compo\nds'J'''''\l'''''''''^y 



Ehosphates in the soil 

 Fig. 62,— Diagram to illustrate the circulation of phosphorus through the 

 agency of bacteria. 



Decoviposition. 

 ^ \ bacterial 



Carbbhydi-at^sk 

 fahaiid'' \ 

 ather C cbjajwunds \ 



GKfien ^lanf respiration, 

 vlctMs^^^^\ 



Fig. 63.— Diagram to illustrate the circulation of carbon through the agency 



of bacteria. 



Dead aniptul protein Decbixiposition bacteria 



_^An-iT)ial 



Free N taken 

 up by free living 

 ' absorbers and 

 root tubercle bacteria 



Nitrates in soil 



Yio. 64 — Diagram to illustrate the circulation of nitrogen through the 

 agency of bacteria. 



