350 SOIL FERTILITY 



legumes. Reference to the use of Bad. radicicola for soil inoculation will be found else- 

 where in this book.' It need only be added at this time that the better appreciation 

 of legumes as a means of maintaining the nitrogen resources of our soils and the 

 availability of good inoculating material will not only encourage the more extensive 

 use of legumes, but will help toward a better understanding and control of soil micro- 

 organisms as one of the major factors of soil fertility. 



BIBLIOGRAPHY 



Lipman, J. G.: Bacteria in Relation to Country Life. New York, igii. 

 Lohnis, F.: Handbuch der landwirtschaftlichen Bakteriologie. Berlin, 1910. 

 Russell, E. J.: Soil Conditions and Plant Growth. 5th ed. London, 1927. 

 Waksman, S. A.: Principles of Soil Microbiology. Baltimore, 1927. 



Stoklasa, J., and Doerell, E. G.: Handbuch der physikalischen und biochemischen Durchfor- 

 schung des Bodens. Berlin, 1926. 



' See chap, xxv by E. B. Fred in this volume. 



