BACTERIA 223 



expected for a particular crop if the bacteria for the crop are 

 already in the^ soil. But little, if any, benefit can be expected 

 from the use of these bacteria if the ground is decidedly in 

 need of other fertilizers, such as phosphates, potash, and lime. 

 But little, if any, benefit can be expected from inoculation if 

 the soil is already rich in nitrogen." 



Carefully wash the roots of different clover plants. Are the nodules 

 of nitrifying bacteria present ? Are they found upon alfalfa and peas in 

 Your region? Are pure cultures of these bacteria sold in your state? 

 Read the state and government bulletins upon these bacteria. 



