1. Horizontal gene transfer among bacteria in terrestrial and aquatic habitats as assessed by microcosm and field studies

   • M. Dröge
   • A. Pühler
   • W. Selbitschka

   REVIEW ARTICLE Pages: 221 - 245

2. Interactions of Azospirillum spp. in soils: a review

   • Y. Bashan

   REVIEW ARTICLE Pages: 246 - 256

3. Variation in competitive abilities of plants and microbes for specific amino acids

   • D. A. Lipson
   • T. K. Raab
   • R. K. Monson

   ORIGINAL PAPER Pages: 257 - 261

4. Axial and radial pressure exerted by earthworms of different ecological groups

   • M. Keudel
   • S. Schrader

   ORIGINAL PAPER Pages: 262 - 269

5. The effect of urea and pig slurry fertilization on denitrification, direct nitrous oxide emission, volatile fatty acids, water-soluble carbon and anthrone-reactive carbon in maize-cropped soil from the Po plain (Modena, Italy)

   • P. G. Arcara
   • C. Gamba
   • R. Marchetti

   ORIGINAL PAPER Pages: 270 - 276

6. Colonization of nonmycorrhizal plants by mycorrhizal neighbours as influenced by the collembolan, Folsomia candida

   • J. N. Klironomos
   • P. Moutoglis

   ORIGINAL PAPER Pages: 277 - 281

7. The measurement of soil fungal:bacterial biomass ratios as an indicator of ecosystem self-regulation in temperate meadow grasslands

   • Richard D. Bardgett
   • Erica McAlister

   ORIGINAL PAPER Pages: 282 - 290

8. Microbial biomass in soils of Russia under long-term management practices

   • N. D. Ananyeva
   • T. S. Demkina
   • W. C. Steen

   ORIGINAL PAPER Pages: 291 - 299

9. Biological and chemical properties of arable soils affected by long-term organic and inorganic fertilizer applications

   • M. Šimek
   • D. W. Hopkins
   • K. Trávník

   ORIGINAL PAPER Pages: 300 - 308

10. Characterization of organic matter in topsoils under rain forest and pasture in the eastern Brazilian Amazon basin

    • L.-S. Koutika
    • F. Andreux
    • C. C. Cerri

    ORIGINAL PAPER Pages: 309 - 313

11. Characterization of the burrow system of the earthworms Lumbricus terrestris and Aporrectodea giardi using X-ray computed tomography and image analysis

    • D. Jégou
    • V. Hallaire
    • P. Tréhen

    ORIGINAL PAPER Pages: 314 - 318

12. Interaction of biochemical quality and particle size of crop residues and its effect on the microbial biomass and nitrogen dynamics following incorporation into soil

    • G. D. Bending
    • Mary K. Turner

    ORIGINAL PAPER Pages: 319 - 327

13. Comparison of two versions of the acetylene inhibition/soil core method for measuring denitrification loss from an irrigated wheat field

    • T. Mahmood
    • R. Ali
    • K. A. Malik

    SHORT COMMUNICATION Pages: 328 - 331

14. Contribution of termites to the breakdown of straw under Sahelian conditions

    • A. Mando
    • L. Brussaard

    SHORT COMMUNICATION Pages: 332 - 334