422 University of California Publications in Agricultural Sciences [Vol.3 



80 



7(i 



60 



50 



40 



30 



20 



10 



ii 



c 



11 



15 



16 



23 



24 



19 20 22 



Mg N. as NH3 produced 

 Fig. 22a. Graph showing ammonifieation in the three horizons of the nine 

 samples of Hanford fine sandy loam. 



26 Soils 



23 



24 



19 20 22 



Mg N. Fixed 



Fig. 22b. Graph showing nitrogen fixation in the three horizons of the nine 

 samples of Hanford fine sandy loam. 



25 Soils 



