Jan. 27, 1919- 



Influence of Salts on Nitric-Nitrogen in Soil 131 



in the remaining cases the quantity required to become toxic to the 

 ammonifiers was much greater than it was for the nitrifiers. In only 



I 



^ ^ ^ ^ <;■;'? "^ «; > _^ '^ ^ 



/TNOj 

 Ca/VOj 

 CaCOj 

 /eC/j 



//4C/ 





:hyx/o-^ 



^i:^aY/o-^ 



^i^sjr/o-f 



■2^<ffX/0-9 



•:^'!^X/0-s 





■.1^'^X/O-J' 



JX/CP--' 

 .7X/0'* 





/x/o-> 

 ^x/o-.f 



2X/0'^ 



tX/O'* 



Fig. 4.-Graphs showing the molecular concentrations which reduce the nitrification to three-fourths 



normal 



three instances were the salts more toxic to ammonifiers than to 

 nitrifiers. 



