1. Adati, M., Untersuchungen über die Rhizosphäre der Pflanzen. J. Soc. Trop. Agr. (Taiwan)11, 57?65 (1939).
2. Agnihothrudu, V., Soil conditions and root diseases. VIII. Rhizosphere microflora of some of the important crop plants of South India. Proc. Indian Acad. Sci. B37, 1?13 (1953).
3. Agnihothrudu, V., State in which fungi occur in the rhizosphere. Naturwissenschaften42, 515?516 (1955).
4. Burges, A., Micro-organisms in the Soil. Hutchinson and Co. Ltd. (Publishers), London (1958).
5. Clark, F. E., Experiments toward the control of the take-all disease of wheat and the Phymatotrichum root rot of cotton. U.S. Dept. Agr. Techn. Bull. No.835 (1942).