1. Contribution of organic acids to the acidification of the rhizosphere of maize seedlings

   • Wolfgang Petersen
   • Michael Böttger

   OriginalPaper Pages: 159 - 163

2. A model to predict transformations and losses of nitrogen in UK pastures grazed by beef cattle

   • D. Scholefield
   • D. R. Lockyer
   • K. C. Tyson

   OriginalPaper Pages: 165 - 177

3. The bioavailability of cadmium to lettuce and cabbage in soils previously treated with sewage sludges

   • Andrew P. Jackson
   • Brian J. Alloway

   OriginalPaper Pages: 179 - 186

4. Mobilization of cadmium and other metals from two soils by root exudates of Zea mays L., Nicotiana tabacum L. and Nicotiana rustica L.

   • M. Mench
   • E. Martin

   OriginalPaper Pages: 187 - 196

5. Nutrient requirements of exotic tree species in Zimbabwe

   • N. Sanginga
   • D. Gwaze
   • M. J. Swift

   OriginalPaper Pages: 197 - 205

6. Diversity of Frankia strains isolated from single nodules of Alnus glutinosa

   • M. Faure-Raynaud
   • C. Daniere
   • A. Capellano

   OriginalPaper Pages: 207 - 211

7. Interference effects of Cassia uniflora Mill on Parthenium hysterophorus L.

   • Syamasundar Joshi

   OriginalPaper Pages: 213 - 218

8. Temporal variations in some plant and soil P pools in two pasture soils of widely different P fertility status

   • K. R. Tate
   • T. W. Speir
   • J. C. Cowling

   OriginalPaper Pages: 219 - 232

9. Microbial biomass and bacteria in two pasture soils: An assessment of measurement procedures, temporal variations, and the influence of P fertility status

   • K. R. Tate
   • D. J. Ross
   • Karina N. Whale

   OriginalPaper Pages: 233 - 241

10. Germination and seedling growth of carrots under salinity and moisture stress

    • U. Schmidhalter
    • J. J. Oertli

    OriginalPaper Pages: 243 - 251

11. Growth responses of mycorrhizal and non-mycorrhizal tropical forage species to different levels of soil phosphate

    • I. Arias
    • I. Koomen
    • D. S. Hayman

    OriginalPaper Pages: 253 - 260

12. Phosphorus efficiency of plants

    • Doris Föhse
    • N. Claassen
    • A. Jungk

    OriginalPaper Pages: 261 - 272

13. Physiological characterization of opine-utilizing rhizobacteria for traits related to plant growth-promoting activity

    • Chantal J. Beauchamp
    • Dion Patrice
    • Hani Antoun

    OriginalPaper Pages: 273 - 279

14. Transport of Rb and Sr to the ear in mature, excised shoots of wheat: Effects of temperature and stem length on Rb removal from the xylem

    • H. Kuppelwieser
    • U. Feller

    OriginalPaper Pages: 281 - 288

15. Response of determinate soybean cultivars to low pH soils

    • J. E. Board
    • A. G. Caldwell

    Short Communication Pages: 289 - 292

16. Seed yield of sorghum grown in an alfisol, in relation to boron nutrition at the reproductive phase

    • S. M. Misra
    • N. C. Sinha
    • P. S. Tomer

    Short Communication Pages: 293 - 296

17. Evaluation of the leaf juice of some higher plants for their toxicity against soil borne pathogens

    • A. Kumar
    • S. C. Tripathi

    Short Communication Pages: 297 - 301

18. Contents of volume 132 1991

    Legacy Pages: 307 - 308