1. Ahmed M H, Eaglesham A R J, Hassovna S, Seaman B, Ayanaba A, Mulongoy K and Pulver E L 1981 Examining the potential for inoculant use with cowpeas in West African soils. Trop. Agric. 58, 325–335.
2. Alexander M 1982 Research to enhance nitrogen fixation: Misplaced emphasis? In Priorities in Biotechnology Research for International Development. National Academic Press, pp. 208–229.
3. Auckland A K 1966 Soybeans in Tanzania I. The exploitation of hybridization for the improvement of soybeans. J. Agric. Sci. Camb. 69, 455–464.
4. Chowdhury M S 1975 Response of soybean to Rhizobium inoculation at Morogoro, Tanzania. In Biological Nitrogen Fixation in Farming Systems of the Tropics. Ed. A. Ayanaba and P I Dart. John Wiley and Sons, Chichester, England. pp 245–253.
5. Chowdhury M S and Doto A L 1981 Biological nitrogen fixation as a criterion for soybean breeding: Preliminary results. In Biological Nitrogen Fixation Technology for Tropical Agriculture. Ed. P H Graham and S C Harris. CIAT Series No. 03E-5 (82), Cali, Columbia, pp 45–48.