Summary
A procedure is put forward for calculating the plant uptake of solutes supplied by diffusion and mass flow to the randomly dispersed roots of a developing root system. The model was tested as follows: (a) for a constant root density, and both transport processes—against a more accurate numerical solution of the same system (b) for an increasing root density, and for supply by diffusion only—by electrical simulation using the analog described in Part I. In both cases, results obtained by the two types of calculation were in close agreement.
A less accurate method which includes both supply mechanisms and does not require a computer is presented, and compared with an electrical simulation when there is no mass flow. Agreement is within 20 per cent.
The model should be useful for predicting plant nutrient uptake from soil, and may be of special interest to modellers of the whole plant system. re]19720905
Similar content being viewed by others
References
Baldwin J. P., Tinker P. B. and Nye P. H., Uptake of solutes by multiple root systems from soil. II—The theoretical effects of rooting density and pattern on uptake of nutrients from soil. Plant and Soil 36, 693–708 (1972).
Barley K. P., The configuration of the root system in relation to nutrient uptake. Adv. Agron. 22, 159–201 (1970).
Gardner W. R., Movement of nitrogen in soil. Agron. Monograh 10, 550–572 (1965).
Marriott, F. H. C., The distance distributions of a random point from randomly spaced lines. Biometrics (in press).
Nye P. H. and Marriott F. H. C., A theoretical study of the distribution of substances around roots resulting from simultaneous diffusion and mass flow. Plant and Soil 30, 459 (1969).
Nye P. H. and Spiers J. A., Simultaneous diffusion and mass flow to plant roots, 8th Intern. Congr. Soil Sci. III, 535 (1964).
Passioura J. B. and Frere M. H., Numerical analysis of the convection and diffusion of solutes to roots. Australian J. Soil Research 5, 149 (1967).
Rowell D. L., Martin M. W. and Nye P. H., The measurement and mechanism of ion diffusion in soils. III—The effect of moisture content and soil solution concentration on the self diffusion of ions in soils. J. Soil Sci. 18, 200 (1967).
Sanders F. E., Tinker P. B. and Nye P. H., Uptake of solutes by multiple root systems from soil. I—An electrical analog of diffuson to root systems. Plant and Soil 34, 453 (1970).
Additional information
Soil Science Laboratory, Department of Agricultural Science ,University of Oxford
Present address: Department of Plant Sciences,University of Leeds
Rights and permissions
About this article
Cite this article
Baldwin, J.P., Nye, P.H. & Tinker, P.B. Uptake of solutes by multiple root systems from soil. Plant Soil 38, 621–635 (1973). https://doi.org/10.1007/BF00010701
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00010701