1. Effective nitrification inhibitors may improve fertilizer recovery in irrigated cotton

   • I. Rochester
   • G. Constable
   • P. Saffigna

   Original Paper Pages: 1 - 6

2. Prolonged simulated acid rain treatment in the subarctic: Effect on the soil respiration rate and microbial biomass

   • P. Vanhala
   • H. Fritze
   • S. Neuvonen

   Original Paper Pages: 7 - 14

3. Repeated sequence RSα is diagnostic for Bradyhizobium japonicum and Bradyrhizobium elkanii

   • A. Hartmann
   • M. Gomez
   • C. Revellin

   Original Paper Pages: 15 - 19

4. Aerobic composting of plant wastes and their effect on the yield of ryegrass and tomatoes

   • O. Kostov
   • G. Petkova
   • J. M. Lynch

   Original Paper Pages: 20 - 25

5. Field measurements of nitrogen fixation in leguminous trees used in agroforestry systems: Influence of ¹⁵N-labeling approaches and reference trees

   • N. Sanginga
   • S. K. A. Danso
   • F. Zapata

   Original Paper Pages: 26 - 32

6. Soil C balance in a long-term field experiment in relation to the size of the microbial biomass

   • E. Witter

   Original Paper Pages: 33 - 37

7. Activity and biomass of soil microorganisms at different depths

   • M. F. E. Lavahun
   • R. G. Joergensen
   • B. Meyer

   Original Paper Pages: 38 - 42

8. Microbial activity and biomass in mixture treatments of soil and biogenic municipal refuse compost

   • R. G. Joergensen
   • B. Meyer
   • B. Wittke

   Original Paper Pages: 43 - 49

9. Tree fallows: A comparison between five tropical tree species

   • K. Jonsson
   • L. Ståhl
   • P. Högberg

   Original Paper Pages: 50 - 56

10. Effects of earthworms on nitrogen mineralization

    • J. J. G. M. Willems
    • J. C. Y. Marinissen
    • J. Blair

    Original Paper Pages: 57 - 63

11. Examination of ester sulfates in Podzolic and Regosolic soils using an immobilized arylsulfatase reactor

    • J. K. Whalen
    • P. R. Wanman

    Original Paper Pages: 64 - 69

12. Interactions between tree seedling roots and humus forms in the control of soil C and N cycling

    • R. L. Bradley
    • J. W. Fyles

    Original Paper Pages: 70 - 79

13. The influence of slug (Arion rufus) mucus and cast material addition on microbial biomass, respiration, and nutrient cycling in beech leaf litter

    • Anne Theenhaus
    • Stefan Scheu

    Original Paper Pages: 80 - 85

14. CH₄ oxidation in two temperate arable soils as affected by nitrate and ammonium application

    • B. W. Hütsch
    • K. Mengel
    • P. Russell

    Original Paper Pages: 86 - 92

15. Mineralization of soil organic nitrogen solubilized by aqua ammonia fertilizer

    • S. Sen
    • P. M. Chalk

    Original Paper Pages: 93 - 98