Water potential measures the energy state of water in soil or a growing medium, expressed as the matric tension a plant root must overcome to extract water. It is typically reported in kilopascals (kPa) or centibars, where more negative readings indicate drier, less plant-available conditions. Because it reflects how hard water is to extract, it complements volumetric moisture rather than duplicating it.
A LoRaWAN water potential device pairs a tensiometer or matric-potential probe with a low-power radio. The node wakes on a schedule, reads tension, and sends a compact payload to a gateway, where a codec decodes the value. Long range and multi-year battery life make this practical across open fields and remote plots.
Typical applications include:
- Precision irrigation scheduling and water-budgeting
- Viticulture, orchards, and row crops
- Greenhouse and substrate-based growing
- Soil hydrology and research
When comparing devices, weigh measurement range and accuracy, probe depth options, battery life, enclosure (IP) rating, supported regional frequency plans, and whether a payload codec is provided.
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Frequently asked questions
What does a LoRaWAN water potential sensor measure?
It measures soil water potential, the matric tension a plant must overcome to draw water from the soil. Readings are usually reported in kilopascals (kPa) or centibars, where more negative values mean drier, harder-to-extract water. Unlike volumetric moisture, water potential reflects plant-available water directly.
How do LoRaWAN water potential sensors send data?
The probe samples tension at set intervals, and the LoRaWAN node encodes the value into a small payload transmitted over a public or private network to a gateway. Because LoRaWAN is low-power and long-range, devices can run for years on battery in remote fields, with readings decoded by a payload formatter.
Where are water potential sensors used?
Common uses include precision irrigation scheduling, viticulture and orchard management, greenhouse and substrate growing, and soil-water research. They help decide exactly when and how much to irrigate, reducing water use while avoiding plant stress.