Plant and Soil 2003, 255:495–502.CrossRef 3. this website Dakora FD, Keya SO: Contribution of legume nitrogen fixation to sustainable agriculture in Sub-Saharan Africa. Soil Biology and

Biochemistry 1997, 29:809–817.CrossRef 4. Dakora FD, Phillips DA: Root exudates as mediators of mineral acquisition in low nutrient environments. Plant and Soil 2002, 245:35–47.CrossRef 5. Peterson HL, Loynachan TE: The significance and application of Rhizobium in agriculture. International Review of Cytology 1981, 13:311–331. 6. Brockwell J, Bottomley PJ: Recent advances in inoculant technology and prospects for the future. Soil Biology and Biochemistry 1995, 27:683–697.CrossRef 7. Peoples MB, Ladha JK, Herridge DF: Enhancing legume N 2 fixation through plant and soil management. Plant and Soil 1995, 174:83–101.CrossRef 8. Svenning MM, Junttila O, Solheim B: Symbiotic growth of indigenous white clover (Trifolium repens) with local Rhizobium leguminosarum biovar trifolii. Physiologia Plantarum 1991, 83:381–389.CrossRef 9. Howieson JG, Malden

J, Yates RJ, O’Hara GW: Techniques for the selection and development of elite inoculant strains of Rhizobium leguminosarum in southern Australia. Symbiosis 2000, 28:33–48. 10. Fening JO, Danso SKA: Variation in symbiotic effectiveness of cowpea bradyrhizobia indigenous to BYL719 purchase Ghanaian soils. Applied Soil Ecology 2002, 21:23–29.CrossRef 11. Carter JM, Tieman JS, Gibson AH: Competitiveness and persistence of strains of rhizobia for faba bean in acid and alkaline soils. Soil Biology and Biochemistry 1995, 27:617–623.CrossRef 12. Denton MW, Reeve WG, Howieson JC, Coventry DR: AZD5153 nmr competitive abilities of common field isolates and a comercial strain of Rhizobium leguminosarum bv. trifolii for clover nodule occupancy. Soil Biology and Biochemistry 2003, 35:1039–1048.CrossRef 13. Okogun JA, Sanginga N: Can introduced and indigenous rhizobial

strains compete for nodule formation by promiscuous soybean in the moist savanna agroecological zone of Nigeria? Biology and Fertility of Soils 2003, 38:26–31.CrossRef 14. Josey DP, Beynon JL, Johnston AWB, Beringer JE: Strain identification in Rhizobium using intrinsic antibiotic resistance. Journal of Applied Bacteriology 1979, 46:343–350. 15. Jones DG, Bromfield ESP: Studies on double strain occupancy of Janus kinase (JAK) nodules and the competitive ability of Rhizobium trifolii on red and white clover grown in soil and agar. Annals of Applied Biology 1979, 94:51–59. 16. Schwinghamer EA, Dudman WF: Methods of identifying strains of diazotrophs. Methods for Evaluating Biological Nitrogen Fixation (Edited by: Bergersen FJ). New York: John Wiley 1980, 337–365. 17. Stein M, Bromfield ESP, Dye M: An assessment of a method based on intrinsic antibiotic resistance for identifying Rhizobium strains. Annals of Applied Biology 1982, 101:261–267.CrossRef 18.