Root growth pressure at the soil–root interface

Edited book (chapter)


Misra, R. K.. 2003. "Root growth pressure at the soil–root interface." Lal, Rattan (ed.) Encyclopedia of soil science, 2nd ed.. New York, NY. United States. Marcel Dekker, Inc.. pp. 1-3
Chapter Title

Root growth pressure at the soil–root interface

Book Chapter CategoryEdited book (chapter)
Book TitleEncyclopedia of soil science, 2nd ed.
Authors
AuthorMisra, R. K.
EditorsLal, Rattan
Page Range1-3
Number of Pages3
Year2003
PublisherMarcel Dekker, Inc.
Place of PublicationNew York, NY. United States
ISBN9780849338304
9780849350511
Digital Object Identifier (DOI)https://doi.org/10.1081/E-ESS-120014315
Web Address (URL)http://www.informaworld.com/smpp/title~content=t713172977
Abstract

Plant roots apply force to make cylindrical cavities in soil, which allow them to grow and elongate. However, in certain situations, roots need to apply only a small amount of force, for instance, when a root tip reaches an existing channel (made by either earthworms, roots of a previous crop, or cracks from shrinkage of soil). Studies in homogeneous soils of uniform strength usually show development of localized zones of compressed soil around roots.

A root growing in soil exerts force within the zone of elongation behind the root cap (Fig. 1) until the elongation zone reaches maturity and the force shifts to a new elongation zone developed through cell division. Roots apply force in axial and radial directions. As roots have a cylindrical shape (some departure from cylindrical shape is expected for roots in very strong soils) they apply force over a cylindrical area. Therefore, root growth pressure is an estimated quantity from separate measurements of force and area. For axial pressure, area over which the force is exerted is circular, which can be estimated from the measurement of diameter in the elongation zone of the root. For radial pressure, force is exerted over a cylindrical surface; so, both diameter and length of the root are important. At the soil-root interface, axial and radial root growth forces are expected to vary with time, and so does the area over which these forces are exerted.

Keywordsradial pressure; axial pressure
ANZSRC Field of Research 2020310806. Plant physiology
410605. Soil physics
410699. Soil sciences not elsewhere classified
Public Notes

©2003 Marcel Dekker, Inc. All rights reserved.

Byline AffiliationsUniversity of the Sunshine Coast
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