Bacteria and protozoa in the rhizosphere


  • Presented at a symposium The rhizosphere on 3 October, 1972, organised by the Physicochemical and Biophysical Panel of the Pesticide Group, Society of Chemical Industry.


The origin and a modern interpretation of the term “rhizosphere”, the zone of soil close to plant roots, are discussed with special reference to soil bacteria and protozoa. The physical, chemical and biological factors which are known to influence the rhizosphere populations of these microbes are briefly considered. Root exudates and electronmicrographs of roots are discussed in relation to microbial ecology.