Summary
This paper evaluates three portable soil water potential sensor types (polymer tensiometers, MPS-2 probes, and pF meters) for their capacity to measure water potential in the field over the range relevant to plant root water uptake. Polymer tensiometers and MPS-2 probes demonstrated good reliability in their respective ranges and, when combined with soil moisture probes, can provide observed in situ water retention curves; pF meters showed poor accuracy below −30 kPa and sensitivity to measurement interval. The findings suggest that in situ water retention curve measurement offers practical advantages for understanding spatial and temporal variability in root zone hydrodynamics.
UK applicability
The methodology and sensor comparison are applicable to UK soil and hydrological monitoring contexts, particularly for improved characterisation of water availability to crops and root systems in variable UK soil conditions. Adoption of these validated sensor combinations could enhance field-based soil water assessment in UK agricultural research and practice.
Key measures
Soil water potential (tension) readings across saturation to wilting point; soil moisture measurements; water retention curve construction; sensor accuracy and reliability across measurement ranges
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 measure water potential across ranges relevant to plant water uptake. The findings assessed the reliability and accuracy of each sensor type for constructing in situ soil water retention curves.
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