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Updated: May 13, 2026

The Calibration and Use of Capacitance Sensors to Monitor Stem Water Content in Trees

The Calibration and Use of Capacitance Sensors to Monitor Stem Water Content in Trees

Published on: December 27, 2017

Can root electrical capacitance be used to predict root mass in soil?

R C Dietrich¹, A G Bengough, H G Jones

¹The James Hutton Institute, Invergowrie, Dundee, UK.

Annals of Botany

|March 16, 2013

Summary

This summary is machine-generated.

Plant capacitance measurements are not a direct assay for root mass. A new model shows capacitance is influenced by substrate water content and stem tissue, not solely root biomass.

Keywords:

Barley Hordeum vulgare Triticum aestivum electrical circuit root mass root phenomics soil capacitance wheat

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Area of Science:

Plant physiology
Electrical engineering
Soil science

Background:

Electrical capacitance is commonly used to estimate plant root mass.
Conventional models interpret capacitance using parallel cylindrical capacitors.
Recent research suggests this interpretation is flawed, proposing a new model.

Purpose of the Study:

To test a new plant capacitance model in solid substrates.
To investigate the relationship between plant capacitance, substrate properties, and plant tissue.

Main Methods:

Determined capacitance of compost and soil based on water content.
Measured capacitance of cereal plants in various substrates and irrigation conditions.
Analyzed capacitance using an electrical circuit model with series components.

Main Results:

Substrate capacitance increased with water content, exceeding plant tissue capacitance.
Maximum plant capacitance in solid substrates correlated with stem cross-sectional area.
Capacitance measurements were modeled as series capacitors (plant tissue and substrate).

Conclusions:

The new physical interpretation of plant capacitance was supported.
Substrate and plant capacitance combine according to physical laws.
Measured capacitance is primarily determined by stem base tissue in wet substrates, not a direct root mass assay.