I OOP 



Soil + Ammonium Sulphate. 



Temp. 13 C. 



15% 



66 



locr 



Additional Nitrate found in Soil &lone. 

 (Lo&rn Gottingen) 



60 



40 



20 



3% 5% 



26 66 



FIG. 25. Effect of moisture on nitrification process in the soil (Traaen). 



