1. Models of the rhizosphere

   • P. R. Darrah

   OriginalPaper Pages: 147 - 158

2. Inadequate iron supply and high bicarbonate impair the symbiosis of peanuts (Arachis hypogaea L.) with different Bradyrhizobium strains

   • Caixian Tang
   • A. D. Robson
   • M. J. Dilworth

   OriginalPaper Pages: 159 - 168

3. Effect of dual inoculation of Douglas fir with the ectomycorrhizal fungus Laccaria laccata and mycorrhization helper bacteria (MHB) in two bare-root forest nurseries

   • R. Duponnois
   • J. Garbaye

   OriginalPaper Pages: 169 - 176

4. Variation in mineral nitrogen under grazed grassland swards

   • S. C. Jarvis
   • D. Barraclough

   OriginalPaper Pages: 177 - 188

5. The effect of soil aggregate size on early growth and shoot-root ratio of maize (Zea mays L.)

   • K. G. Alexander
   • M. H. Miller

   OriginalPaper Pages: 189 - 194

6. Comparative studies of nickel, cobalt, and copper uptake by some nickel hyperaccumulators of the genus Alyssum

   • F. A. Homer
   • R. S. Morrison
   • R. D. Reeves

   OriginalPaper Pages: 195 - 205

7. Formation of nodules on non-nodulating soybean T201 after treatment with 2,4-dichlorophenoxyacetate

   • Shoichiro Akao
   • Satoshi Nakata
   • Tadakatsu Yoneyama

   OriginalPaper Pages: 207 - 212

8. Interactions between Sarocladium oryzae and stem attacking fungal pathogens of rice

   • S. S. Gnanamanickam
   • T. W. Mew

   OriginalPaper Pages: 213 - 219

9. Effect of Xanthobacter, isolated and characterized from rice roots, on growth of wetland rice

   • H. Keith Reding
   • Peter G. Hartel
   • Juergen Wiegel

   OriginalPaper Pages: 221 - 229

10. Kinetic responses of Pseudoroegneria roots to localized soil enrichment

    • R. B. Jackson
    • M. M. Caldwell

    OriginalPaper Pages: 231 - 238

11. Organic manure additions and the leaf water potential and yield of barley

    • S. A. Materechera
    • G. R. Mehuys

    OriginalPaper Pages: 239 - 246

12. Heterogeneity of soil and plant N and C associated with individual plants and openings in North American shortgrass steppe

    • Paul B. Hook
    • Ingrid C. Burke
    • William K. Lauenroth

    OriginalPaper Pages: 247 - 256

13. Soil denitrification in three cropping systems characterized by differences in nitrogen and carbon supply

    • Bo H. Svensson
    • Leif Klemedtsson
    • Thomas Rosswall

    OriginalPaper Pages: 257 - 271

14. Soil denitrification in three cropping systems characterized by differences in nitrogen and carbon supply

    • Leif Klemedtsson
    • Stephen Simkins
    • Thomas Rosswall

    OriginalPaper Pages: 273 - 286

15. Simulation of field scale denitrification losses from soils under grass ley and barley

    • Holger Johnsson
    • Leif Klemedtsson
    • H Bo Svensson

    OriginalPaper Pages: 287 - 302

16. Distribution of nitrogen in common bean (Phaseolus vulgaris L.) genotypes selected for differences in nitrogen fixation ability

    • D. J. Wolyn
    • D. A. St. Clair
    • F. A. Bliss

    OriginalPaper Pages: 303 - 311

17. Post-emergence treatment of iron-related rice-seedling chlorosis

    • G. H. Snyder
    • D. B. Jones

    Short Communication Pages: 313 - 317

18. Contents of volume 138 1991

    Legacy Pages: 323 - 325