1. Foreword

   • Björn Sigurbjörnsson

   EditorialNotes Pages: v - vi

2. General recommendations

   Announcement Pages: vii - vii

3. Efficiencies and inefficiencies in the legume/Rhizobium symbiosis—A review

   • C. A. Atkins

   ReviewPaper Pages: 273 - 284

4. Improving nitrogen fixation in legumes by plant breeding; the relevance of host selection experiments in red clover (Trifolium pratense L.) and subterranean clover (T. subterraneum L.)

   • P. S. Nutman

   OriginalPaper Pages: 285 - 301

5. A multiple-trait breeding program for improving the symbiosis for N₂ fixation betweenMedicago sativa L. andRhizobium meliloti

   • D. K. Barnes
   • G. H. Heichel
   • W. R. Ellis

   OriginalPaper Pages: 303 - 314

6. Selection for improved nitrogen fixation inGlycine max (L.) Merr. andPhaseolus vulgaris L.

   • P. H. Graham
   • S. R. Temple

   OriginalPaper Pages: 315 - 327

7. Developing a breeding strategy to exploit quantitative variation in symbiotic nitrogen fixation

   • L. R. Mytton

   OriginalPaper Pages: 329 - 335

8. Mutation breeding of grain legumes

   • A. Micke

   OriginalPaper Pages: 337 - 357

9. Gene centres, a source for genetic variants in symbiotic nitrogen fixation: The symbiotic response of the cultivated pea toRhizobium leguminosarum strains from Europe and the Middle East

   • T. A. Lie
   • D. Göktan

   OriginalPaper Pages: 359 - 367

10. Field evaluation of symbiotic nitrogen fixation by rhizobial strains using¹⁵N methodology

    • G. Hardarson
    • F. Zapata
    • S. K. A. Danso

    OriginalPaper Pages: 369 - 375

11. Rhizobium inoculation trials designed to support a tropical forage legume selection programme

    • Rosemary Sylvester-Bradley

    OriginalPaper Pages: 377 - 386

12. Breeding soybeans for the tropics capable of nodulating effectively with indigenousRhizobium spp.

    • E. A. Kueneman
    • W. R. Root
    • J. Hohenberg

    OriginalPaper Pages: 387 - 396

13. Effect of plant genotype and nitrogen fertilizer on symbiotic nitrogen fixation by soybean cultivars

    • G. Hardarson
    • F. Zapata
    • S. K. A. Danso

    OriginalPaper Pages: 397 - 405

14. Quantitative assessment of symbiotic nitrogen fixation in diverse mutant lines of field bean (Vicia faba minor)

    • H. Brunner
    • F. Zapata

    OriginalPaper Pages: 407 - 413

15. Host genes inPisum sativum L. conferring resistance to EuropeanRhizobium leguminosarum strains

    • T. A. Lie

    OriginalPaper Pages: 415 - 425

16. Modification of symbiotic interaction of pea (Pisum sativum L.) andRhizobium leguminosarum by induced mutations

    • E. Jacobsen

    OriginalPaper Pages: 427 - 438