1. Microscale fumigation-extraction and substrate-induced respiration methods for measuring microbial biomass in barley rhizosphere

   • Lars Stoumann Jensen
   • Jan Sørensen

   Research Articles Pages: 151 - 161

2. Evaluation of powdered pine bark for control ofMeloidogyne arenaria andHeterodera glycines on soybean

   • Nancy Kokalis-Burelle
   • Rodrigo Rodríguez-Kábana
   • Peggy S. King

   Research Articles Pages: 163 - 168

3. Changes in populations of soil microorganisms, nematodes, and enzyme activity associated with application of powdered pine bark

   • Nancy Kokalis-Burelle
   • Rodrigo Rodríguez-Kábana

   Research Articles Pages: 169 - 175

4. The use of carbon isotope ratios to evaluate legume contribution to soil enhancement in tropical pastures

   • I. M. Rao
   • M. A. Ayarza
   • R. J. Thomas

   Research Articles Pages: 177 - 182

5. Growth and nitrogen fixation inAlnus glutinosa (L.) Gaertn. under carbon dioxide enrichment of the root atmosphere

   • A-H. Brioua
   • C. T. Wheeler

   Research Articles Pages: 183 - 191

6. Leaching and crop recovery of¹⁵N from ammonium sulphate and labelled maize (Zea mays) material in lysimeters at a site in Zimbabwe

   • Wilberforce Kamukondiwa
   • Lars Bergström

   Research Articles Pages: 193 - 201

7. Tillage effect on seasonal nitrogen availability in corn supplied with legume green manures

   • Z. Dou
   • R. H. Fox
   • J. D. Toth

   Research Articles Pages: 203 - 210

8. The availability of soil boron fractions to olive trees and barley and their relationships to soil properties

   • C. D. Tsadilas
   • N. Yassoglou
   • Ch. Kallianou

   Research Articles Pages: 211 - 217

9. Relations between grapevine replant disease and root colonization of grapevine (Vitis sp.) by fluorescent pseudomonads and endomycorrhizal fungi

   • Christina Waschkies
   • A. Schropp
   • H. Marschner

   Research Articles Pages: 219 - 227

10. Nodulation patterns of actinorhizal plants in the family rosaceae

    • Steven J. Kohls
    • Jyothi Thimmapuram
    • Jeffrey O. Dawson

    Research Articles Pages: 229 - 239

11. Growth, biomass allocation and water use efficiency of two wheat cultivars in a mediterranean environment; a pot experiment under field conditions

    • E. J. Veneklaas
    • J. M. Peacock

    Research Articles Pages: 241 - 247

12. A model relating the maximum nitrate inflow of lettuce (Lactuca satvia L.) to the growth of roots and shoots

    • B. Steingrobe
    • M. K. Schenk

    Research Articles Pages: 249 - 257

13. A simple model for estimating the contribution of nitrogen mineralization to the nitrogen supply of crops from a stabilized pool of soil organic matter and recent organic input

    • F. J. Matus
    • J. Rodríguez

    Research Articles Pages: 259 - 271

14. Aluminum-induced deposition of (1,3)-β-glucans (callose) inTriticum aestivum L.

    • Kymberly A. Schreiner
    • John Hoddinott
    • Gregory J. Taylor

    Research Articles Pages: 273 - 280

15. Effect of elevated CO₂ on carbon and nitrogen distribution within a tree (Castanea sativa Mill.) — soil system

    • H. Rouhier
    • G. Billès
    • P. Bottner

    Research Articles Pages: 281 - 292

16. Inoculated common beans are protected againstMacrophomina phaseolina byBurkholderia cepacia UPR 5C

    • Alfonsina Sánchez
    • R. Echávez-Badel
    • E. C. Schröder

    Research Articles Pages: 293 - 297

17. Diurnal cycles of rhizosphere acidification byPinus contorta seedlings

    • James D. Stewart
    • Victor J. Lieffers

    Short Communication Pages: 299 - 302

18. Messenger RNA from diverse classes of alfalfa leghemoglobin genes show a similar pattern of spatial expression in symbiotic root nodules

    • Eliot J. Davidowitz
    • Christopher A. Cullis
    • Naomi Lang-Unnasch

    Short Communication Pages: 303 - 307

19. Response of root mRNA population to sulphate shortage in maize seedlings

    • M. Malagoli
    • A. Trettenero
    • G. Ferrari

    Short Communication Pages: 309 - 313

20. The effect of plant material grown under elevated CO₂ on soil respiratory activity

    • J. Taylor
    • A. S. Ball

    Short Communication Pages: 315 - 318

21. Acknowledgement

    Acknowledgments Pages: 319 - 323