Plant and Soil

, Volume 72, Issue 1, pp 13–29

The acquisition of phosphorus byLupinus albus L.

V. The diffusion of exudates away from roots: a computer simulation
  • W. K. Gardner
  • D. G. Parbery
  • D. A. Barber
  • L. Swinden
Article

DOI: 10.1007/BF02185090

Cite this article as:
Gardner, W.K., Parbery, D.G., Barber, D.A. et al. Plant Soil (1983) 72: 13. doi:10.1007/BF02185090

Summary

A model predicted that the concentration profile of exudate would be less steep and its concentration values higher for larger diameter roots and that rhizosphere volume/g of root would be maximised at a particular root size for a given exudation rate. Root hairs, if active in secretion, would increase the rhizosphere volume/g of root and the substrate concentrations in it. Proteoid roots would increase the concentration of diffusing substance even further, although the rhizosphere volume per g of root may decline due to overlap effects. These effects are discussed in relation to the rate and extent of reactions between exudates and the soil.

Key words

ExudationLupinsLupinus albus L.Micro-organismsProteoid rootsRhizosphere

Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1983

Authors and Affiliations

  • W. K. Gardner
    • 1
  • D. G. Parbery
    • 1
  • D. A. Barber
    • 1
  • L. Swinden
    • 1
  1. 1.Department of Plant Sciences, School of Agriculture and ForestryUniversity of MelbourneParkvilleAustralia
  2. 2.Victorian Crops Research InstituteHorshamAustralia