1. Foreword

   EditorialNotes Pages: ix - xi

2. Nitrogen fertilization in citrus orchards

   • S. Dasberg

   OriginalPaper Pages: 1 - 9

3. Soil-oxygen and plant-root interaction: An electrical analog study

   • M. B. Kirkham

   OriginalPaper Pages: 11 - 19

4. Effect of calcium on the absorption and translocation of heavy metals in excised barley roots: Multi-compartment transport box experiment

   • T. Kawasaki
   • M. Moritsugu

   OriginalPaper Pages: 21 - 34

5. Influence of differences in nutrition on important quality characteristics of some agricultural crops

   • K. Müller
   • J. Hippe

   OriginalPaper Pages: 35 - 45

6. Nitrogen transformation processes in relation to improved cultural practices for lowland rice

   • S. K. De Datta

   OriginalPaper Pages: 47 - 69

7. Nitrogen budgets in flooded soils used for rice production

   • D. S. Mikkelsen

   OriginalPaper Pages: 71 - 97

8. The effects of low, regulated supplies of nitrate and ammonium nitrogen on the growth and composition of perennial ryegrass

   • S. C. Jarvis

   OriginalPaper Pages: 99 - 112

9. Changes in P forms and availability as influenced by management practices

   • I. P. O’halloran
   • J. W. B. Stewart
   • E. De Jong

   OriginalPaper Pages: 113 - 126

10. The mechanism of rock phosphate solubilization in the rhizosphere

    • P. H. Nye
    • G. J. D. Kirk

    OriginalPaper Pages: 127 - 134

11. The rock-phosphate solubilizing capacity ofPueraria javanica as affected by soil pH, superphosphate priming effect and symbiotic N₂ fixation

    • P. H. De Swart
    • A. Van Diest

    OriginalPaper Pages: 135 - 147

12. Relative efficiency of nitrogen fixation and the occurrence of hydrogenase in pea root nodules

    • R. O. D. Dixon

    OriginalPaper Pages: 149 - 156

13. Metabolism and translocation of fixed nitrogen in the nodulated legume

    • C. A. Atkins

    OriginalPaper Pages: 157 - 169

14. Co-evolution of the legume-Rhizobium association

    • T. A. Lie
    • D. Göktan
    • E. Anlarsal

    OriginalPaper Pages: 171 - 181

15. Endophyte transmission and activity in the Anabaena-Azolla association

    • J. H. Becking

    OriginalPaper Pages: 183 - 212

16. ¹⁵N-Determined effect of inoculation with N₂ fixing bacteria on nitrogen assimilation in Western Canadian wheats

    • R. J. Rennie
    • J. B. Thomas

    OriginalPaper Pages: 213 - 223

17. Total and CO-reactive heme content of actinorhizal nodules and the roots of some non-nodulated plants

    • John D. Tjepkema
    • Darwin J. Asa

    OriginalPaper Pages: 225 - 236

18. Biological control of nematodes: Soil amendments and microbial antagonists

    • R. Rodriguez-Kabana
    • G. Morgan-Jones
    • I. Chet

    OriginalPaper Pages: 237 - 247

19. Practical aspects of mycorrhizal technology in some tropical crops and pastures

    • R. H. Howeler
    • E. Sieverding
    • S. Saif

    OriginalPaper Pages: 249 - 283

20. Effect of spore concentration on germination and autotropism inTrichoderma hamatum

    • Lea Nol
    • Yigal Henis

    OriginalPaper Pages: 285 - 295

21. The effect of fertilization on litter decomposition in clearfelled spruce stands

    • B. D. Titus
    • D. C. Malcolm

    OriginalPaper Pages: 297 - 322

22. The effect of spray volume on spray partitioning between plant and soil

    • G. B. Shaw
    • R. B. McKercher
    • R. Ashford

    OriginalPaper Pages: 323 - 331

23. Comparative study of soil bacterial flora as influenced by the application of a pesticide, pentachlorophenol (PCP)

    • Kyo Sato
    • H. Kato
    • C. Furusaka

    OriginalPaper Pages: 333 - 343

24. Response of cassava to water stress

    • Mabrouk A. El-Sharkawy
    • James H. Cock

    OriginalPaper Pages: 345 - 360

25. Activity of root systems of six plant species at different stages of development

    • L. K. Wiersum

    OriginalPaper Pages: 361 - 370