Summary
This controlled drying experiment evaluated three soil water potential sensors for their capacity to measure in situ water retention curves across the range of tensions relevant to plant root water uptake. Polymer tensiometers and MPS-2 probes demonstrated good reliability within their respective operational ranges and together can provide observed water retention curves when combined with soil moisture measurements, whilst pF meters showed poor accuracy below −30 kPa and exhibited problematic sensitivity to measurement interval. The findings suggest that combined in situ water retention curve measurements could provide valuable spatial and temporal variability information to complement laboratory techniques and geophysical observations.
UK applicability
These sensor comparison findings are applicable to UK soil and hydrological research, particularly for characterising root zone water dynamics in varied soil types and climates. The results may inform instrument selection for UK field monitoring programmes investigating soil water retention and plant-available water under different land management and climate conditions.
Key measures
Soil water potential (measured in kPa and pF units); soil water retention curves; measurement accuracy and reliability across tension ranges from saturation to wilting point; response sensitivity to measurement interval
Outcomes reported
The study compared three types of soil water potential sensors (polymer tensiometers, MPS-2 probes, and pF meters) in a controlled drying experiment to evaluate their ability to capture in situ soil water retention curves across tensions relevant to plant water uptake. The researchers assessed the reliability, accuracy, and measurement sensitivity of each sensor type across different water potential ranges.
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