1. Bagyaraj, J. and Rangaswami, G., Effect of fertilizers on the microflora of soil and the rhizosphere of Ragi (Eleusine coracana Gaerten) Indian J. Microbiol. 7, 29–38 (1967).
2. Bunt, J. S. and Rovira, A. D., Microbiological studies of some sub-antarctic soils. J. Soil Sci. 6, 119–128 (1955).
3. Chandra, P., Beaten, J. D., and Read, D. W. L., Effect of fertilizers on the bacterial population of a Saskatchewan soil. Nature 193, 1308–1309 (1962).
4. Collins, C. H., Microbiological Methods, Butterworths, London (1964).
5. Emmimath, V. S. and Rangaswami, G., Studies on the effects of heavy doses of nitrogenous fertilizers on the soil and rhizosphere microflora of rice. The Mysore J. Agr. Sci. 5, 39–58 (1971).