1. Studies on the nitrogen-fixing bacteria of the genusbeijerinckia

   • J. H. Becking

   OriginalPaper Pages: 297 - 322

2. Effect of volatile constituents ofScaptocoris talpa Champ. on the growth of soil fungi

   • M. I. Timonin

   OriginalPaper Pages: 323 - 334

3. Some differences between the soils ofRhizophora andAvicennia mangrove swamps in sierra leone

   • P. R. Hesse

   OriginalPaper Pages: 335 - 346

4. The effect of ammonium nitrogen on fixation of elemental nitrogen inAlnus andMyrica

   • W. D. P. Stewart
   • G. Bond

   OriginalPaper Pages: 347 - 359

5. The effect of oxygen concentration on the decomposition of organic materials in soil

   • D. J. Greenwood

   OriginalPaper Pages: 360 - 376

6. Iodine as a micronutrient for plants

   • G. W. F. H. Borst Pauwels

   OriginalPaper Pages: 377 - 392

7. Boron-deficiency dieback in pines

   • J. W. Vail
   • M. S. Parry
   • W. E. Calton

   OriginalPaper Pages: 393 - 398