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Related Concept Videos

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Updated: Dec 10, 2025

In Situ Soil Moisture Sensors in Undisturbed Soils
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Spatially Resolved Root Water Uptake Determination Using a Precise Soil Water Sensor.

Dagmar van Dusschoten1, Johannes Kochs2, Christian W Kuppe2

  • 1Forschungszentrum Jülich, Institute of Bio- and Geosciences-Plant Sciences, 52425 Jülich, Germany d.van.dusschoten@fz-juelich.de.

Plant Physiology
|September 5, 2020
PubMed
Summary
This summary is machine-generated.

A new sensor, the soil water profiler (SWaP), precisely measures local soil water content and root water uptake (RWU) in plants. This affordable, noninvasive tool offers new insights into soil-plant hydrology and root water uptake distribution.

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Area of Science:

  • Soil Science
  • Plant Physiology
  • Hydrology

Background:

  • Accurate measurement of local root water uptake (RWU) is crucial for understanding plant water use and regulation.
  • Existing methods for measuring soil water content and RWU are often invasive, expensive, or lack precision.
  • There is a need for affordable, noninvasive technologies to study soil-plant water dynamics.

Purpose of the Study:

  • To develop and validate a novel sensor, the soil water profiler (SWaP), for precise, noninvasive measurement of local soil water content (θ) and root water uptake.
  • To demonstrate the SWaP's capability in quantifying RWU distribution and distinguishing it from soil water redistribution.
  • To explore the application of SWaP in observing dynamic changes in RWU and soil water profiles in a growing maize plant.

Main Methods:

  • The SWaP sensor utilizes a resonant circuit formed by copper sheets and a coil, coupled to a vector network analyzer to measure resonance frequency.
  • Soil water content (θ) is calibrated against the measured resonance frequency, achieving high precision (6.10-5 cm3 ⋅ cm-3) and accuracy (0.002 cm3 ⋅ cm-3).
  • Sensors integrated into a positioning system measure θ with 1 cm spatial resolution and 24 min temporal resolution along soil depth, combined with controlled light modulation to infer RWU.

Main Results:

  • The SWaP sensor demonstrated high precision and accuracy in measuring soil water content (θ).
  • The system successfully quantified the component of RWU distribution that varies with total plant water uptake under controlled light and transpiration conditions.
  • Observations revealed clear changes in plant-driven RWU and soil water redistribution profiles as a maize plant depleted soil moisture.

Conclusions:

  • The SWaP is a cost-effective, noninvasive device providing unprecedented precision for measuring RWU and soil water redistribution.
  • This technology offers significant potential for advancing our understanding of soil-plant hydrology.
  • SWaP is a promising tool for functional root phenotyping in controlled environments, particularly in nonsaline conditions.