SOIL BACTERIOLOGY 



In the case of the inoculated cultures with nitrates present 

 proceed as follows: (a) Evaporate 10 c.c. to dryness, and 

 (b) dilute 10 c.c. to 100 c.c., and evaporate 10 c.c. of this 

 to dryness (see page 143). 



7. From the results of the quantitative analyses fill in 

 the following table: 



TABLE 24. Denitrification by Pure Cultures of Bacteria 



Exercise 23 



Denitrification with the Formation of Nitrous Oxid 

 (Optional) 



i. Prepare in glass-stoppered bottles medium 34 plus 

 80 grams potassium nitrate in each liter. 



