EFFECT .OF BACILLUS RADICICOLA ON ALFALFA 71 



k LFALFA ALFALFA 



'NOCULATEO 



' 



Fig. 7. Alfalfa in sterilized sand to which plant food minus nitrogen has 



been added. 



Exercise 36 



Effect of Bacillus Radicicola on the Growth and the 

 Nitrogen Content of Alfalfa (Optional) 



i. Prepare four J-gallon jars of clean sand and four of 

 coal-ashes. 



