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Updated: Jun 28, 2026

Manufacturing Simple and Inexpensive Soil Surface Temperature and Gravimetric Water Content Sensors
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Manufacturing Simple and Inexpensive Soil Surface Temperature and Gravimetric Water Content Sensors

Published on: December 21, 2019

Distributable screen-printed soil pH sensor demonstrates robust response across variable soil conditions.

Juan Pablo Cisneros-Barba1, Catherine A Crichton1, Taylor Sharpe1

  • 1Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, 1111 Engineering Drive, Boulder, CO, 80309, USA.

Scientific Reports
|June 26, 2026
PubMed
Summary

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This summary is machine-generated.

A new screen-printed carbon-alizarin sensor offers continuous, recalibration-free soil pH monitoring. This robust sensor technology enables precise, long-term in situ measurements for improved agricultural management.

Area of Science:

  • Agricultural Science
  • Sensor Technology
  • Environmental Monitoring

Background:

  • Soil pH management is crucial for crop productivity.
  • Current pH measurement methods face challenges in spatiotemporal accuracy, recalibration, and cost.
  • Need for robust, continuous, and cost-effective soil pH sensing solutions.

Purpose of the Study:

  • To develop and evaluate a distributable, screen-printed carbon-alizarin-based sensor for long-term, continuous soil pH measurement.
  • To assess the sensor's robustness across various soil conditions and environmental factors.
  • To enable autonomous, in situ pH data collection for improved agricultural insights.

Main Methods:

  • Utilized square-wave voltammetry to analyze the alizarin redox peak position, correlating it with soil pH.
Keywords:
Precision agriculturePrinted electronicsSoil pHSquare wave voltammetrypH Sensor

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  • Screen-printed carbon electrodes with alizarin were integrated with a custom potentiostat.
  • Tested sensor performance under varying soil moisture, compaction, and soil types.

    • Main Results:

    • The sensor demonstrated a pH-proportional alizarin redox peak position, invariant over time.
    • Sensor exhibited robustness in diverse environmental and installation conditions without recalibration.
    • Autonomous data logging and continuous field operation for months confirmed reliable in situ pH sensing.

    Conclusions:

    • The screen-printed carbon-alizarin sensor provides a reliable method for continuous, in situ soil pH monitoring.
    • This technology addresses limitations of traditional sampling methods, enabling spatiotemporally dense pH data collection.
    • The developed sensor system is suitable for long-term agricultural and environmental applications.