NITRIFICATION 



101 







Fig. 21. Effect of Nitrifying Bacteria on the Growth of Barley 



In the absence of nitrogen in the soil the growth of the plant has been small. 

 The addition of sulphate of ammonia has resulted in a far better growth. The 

 addition of the same substance and of nitrifying bacteria that change the 

 ammoniacal nitrogen to nitric nitrogen has enabled the plant to make a 

 normal growth 



After Fred. 



