@INPROCEEDINGS {RANGA RAO:1982, title = {Studies on the Persistence of Introduced Strain of Rhizobium japonicum in soil During Fallow and the Effects on Soybean Growth and Yield}, author = {Ranga Rao, V. and Thottappilly, G. and Ayanaba, A. }, editor = {Graham, P. H. and Harris, S. C}, booktitle = {Biological Nitrogen Fixation Technology for Tropical Agriculture}, year = {1982}, pages = {309--315}, note = {Center International de Agriculture Tropical}, }