1. Leaf position-dependent changes in proline, pyrroline-5-carboxylate reductase activity and water relations under salt-stress in genetically stable salt-tolerant somaclones ofBrassica juncea L.

   • Shashi Madan
   • H. S. Nainawatee
   • J. B. Chowdhury

   Research Article Pages: 151 - 156

2. Effect of pH on competition for nodule occupancy by type I and type II strains ofRhizobium leguminosarum bv.phaseoli

   • S. D. Frey
   • L. K. Blum

   Research Article Pages: 157 - 164

3. Soil acidity in relation to groundnut-Bradyrhizobium symbiotic performance

   • Diman van Rossum
   • Arthur Muyotcha
   • Fred C. Boogerd

   Research Article Pages: 165 - 175

4. Siderophore production byBradyrhizobium spp. strains nodulating groundnut

   • Diman van Rossum
   • Arthur Muyotcha
   • Fred C. Boogerd

   Research Article Pages: 177 - 187

5. Nitrous oxide and carbon dioxide emissions from pelletized and nonpelletized poultry litter incorporated into soil

   • M. L. Cabrera
   • S. C. Chiang
   • S. A. Thompson

   Research Article Pages: 189 - 195

6. Pre-germination effects on mechanically impeded root growth of barley (Hordeum vulgare L)

   • K. M. Volkmar

   Research Article Pages: 197 - 202

7. Contribution by two arbuscular mycorrhizal fungi to P uptake by cucumber (Cucumis sativus L.) from³²P-labelled organic matter during mineralization in soil

   • Erik J. Joner
   • Iver Jakobsen

   Research Article Pages: 203 - 209

8. The temperature-dependence of the maximum axial growth pressure of roots of pea (Pisum sativum L.)

   • W. R. Whalley
   • L. J. Clark
   • A. R. Dexter

   Research Article Pages: 211 - 215

9. Characterisation of the type and extent of nutrient limitation in grassland vegetation using a bioassay with intact sods

   • Han Olff
   • Dick M. Pegtel

   Research Article Pages: 217 - 224

10. Determination of stable molybdenum isotopes by thermionic mass spectrometry for tracer studies of molybdenum plant metabolism

    • M. Saumer
    • E. Gantner
    • H. J. Ache

    Research Article Pages: 225 - 233

11. Denitrification and N₂O emission from urine-affected grassland soil

    • C. A. M de Klein
    • R. S. P. van Logtestijn

    Research Article Pages: 235 - 241

12. Distribution of soil fractions and location of soil bacteria in a vertisol under cultivation and perennial grass

    • M. Kabir
    • J. L. Chotte
    • L. Jocteur Monrozier

    Research Article Pages: 243 - 255

13. Soil P resources, plant growth and rooting characteristics in nutrient poor upland grasslands

    • A. E. S. Macklon
    • L. A. Mackie-Dawson
    • A. Lilly

    Research Article Pages: 257 - 266

14. Root growth and nitrate utilization of maize cultivars under field conditions

    • F. Wiesler
    • W. J. Horst

    Research Article Pages: 267 - 277

15. Models for predicting soil zinc availability for barley

    • X. Wu
    • I. Aasen

    Research Article Pages: 279 - 285

16. Interference effects of the invasive plantCarduus nutans L. against the nitrogen fixation ability ofTrifolium repens L.

    • D. A. Wardle
    • K. S. Nicholson
    • A. Rahman

    Research Article Pages: 287 - 297

17. The response of seedlings of two dipterocarp species to nutrient additions and ectomycorrhizal infection

    • Lee Su See
    • I. J. Alexander

    Research Article Pages: 299 - 306