1. Preface

   EditorialNotes Pages: 1 - 1

2. Biological nitrogen fixation: An efficient source of nitrogen for sustainable agricultural production?

   • M. B. Peoples
   • D. F. Herridge
   • J. K. Ladha

   ReviewPaper Pages: 3 - 28

3. Sustainable agriculture in the semi-arid tropics through biological nitrogen fixation in grain legumes

   • S. P. Wani
   • O. P. Rupela
   • K. K. Lee

   ReviewPaper Pages: 29 - 49

4. Enhancing crop legume N₂ fixation through selection and breeding

   • D. F. Herridge
   • S. K. A. Danso

   ReviewPaper Pages: 51 - 82

5. Enhancing legume N₂ fixation through plant and soil management

   • M. B. Peoples
   • J. K. Ladha
   • D. F. Herridge

   ReviewPaper Pages: 83 - 101

6. Role of legumes in providing N for sustainable tropical pasture systems

   • R. J. Thomas

   ReviewPaper Pages: 103 - 118

7. Management of biological N₂ fixation in alley cropping systems: Estimation and contribution to N balance

   • N. Sanginga
   • B. Vanlauwe
   • S. K. A. Danso

   ReviewPaper Pages: 119 - 141

8. Manipulation of rhizobia microflora for improving legume productivity and soil fertility: A critical assessment

   • John Brockwell
   • Peter J. Bottomley
   • Janice E. Thies

   ReviewPaper Pages: 143 - 180

9. Green manure technology: Potential, usage, and limitations. A case study for lowland rice

   • M. Becker
   • J. K. Ladha
   • M. Ali

   ReviewPaper Pages: 181 - 194

10. Biological nitrogen fixation associated with sugar cane and rice: Contributions and prospects for improvement

    • R. M. Boddey
    • O. C. de Oliveira
    • J. Döbereiner

    ReviewPaper Pages: 195 - 209

11. Biological N₂ fixation by heterotrophic and phototrophic bacteria in association with straw

    • Margaret M. Roper
    • J. K. Ladha

    ReviewPaper Pages: 211 - 224

12. Potential and pitfalls of trying to extend symbiotic interactions of nitrogen-fixing organisms to presently non-nodulated plants, such as rice

    • F. J. de Bruijn
    • Y. Jing
    • F. B. Dazzo

    ReviewPaper Pages: 225 - 240

13. New techniques for studying competition by Rhizobia and for assessing nitrogen fixation in the field

    • Kate J. Wilson
    • Mark B. Peoples
    • Richard A. Jefferson

    ReviewPaper Pages: 241 - 253

14. Future benefits from biological nitrogen fixation: An ecological approach to agriculture

    • K. E. Giller
    • G. Cadisch

    ReviewPaper Pages: 255 - 277

15. Research evaluation and impact analysis of biological nitrogen fixation

    • M. C. S. Bantilan
    • C. Johansen

    ReviewPaper Pages: 279 - 286

16. Author index

    Legacy Pages: 287 - 287