What question did this study set out to answer?

The aim is to calibrate soil-moisture measurement devices accurately using a primary method of water vapour detection.

February 28, 2026Open Access

Deliverable D1: Report on the calibration of soil-moisture measurement devices using a primary method, based on evolved water vapour detection, and transfer standards, such as "standardised" loss on drying (LoD) or fibre-coupled spectrometers, to ensure SI-traceable point-scale soil moisture measurements with uncertainties of 5 % under laboratory conditions

Key Points

The aim is to calibrate soil-moisture measurement devices accurately using a primary method of water vapour detection.
Utilized evolved water vapour detection as a primary calibration method.
Incorporated transfer standards such as loss on drying (LoD) and fibre-coupled spectrometers.
Conducted measurements under controlled laboratory conditions.
Achieved SI-traceable soil moisture measurements.
Maintained measurement uncertainties within 5%.
Ensured reliable calibration methodologies for soil-moisture measurements.

Abstract

This document presents Deliverable D1, "Report on the calibration of soil-moisture measurement devices using a primary method based on evolved water vapour detection, and transfer standards such as standardised loss on drying (LoD) or fibre-coupled spectrometers, to ensure SI-traceable point-scale soil moisture measurements with uncertainties of 5 % under laboratory conditions," of the 21GRD08 SoMMet (Soil Moisture Metrology) project, funded under the European Partnership on Metrology from October 2022 to September 2025. The project 21GRD08 SoMMet has received funding from the European Partnership on Metrology, co-financed from the European Union’s Horizon Europe Research and Innovation Programme and by the Participating States. • Funder name: European Partnership on Metrology• Funder ID: 10.13039/100019599• Grant number: 21GRD08 SoMMet

Key Points

Abstract

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