BACTEKIA 223 



expected for a piirtieulur ('i()[) it" -the bacteria for the cn^) are 

 already in the soil, liut little, if any, benelit 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 Iruni inuculalion if 

 the soil is already ricli 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 iu your state? 

 Read the state and government bulletins upon these bacteria. 



