Soil Monitoring
ND-TRS21 Soil Water Potential & Temperature Sensor
What is the ND-TRS21? The ND-TRS21 measures soil matric water potential — the metric that directly tells you whether plants can extract water from the soil. With a range from 0 to −6553.5 kPa and ±10 % accuracy from −5 to −100 kPa, it is the gold standard for irrigation scheduling and plant water-stress research connected to the yDoc ML-525 datalogger.
The ND-TRS21 measures soil matric water potential — the metric that directly tells you whether plants can extract water from the soil. With a range from 0 to −6553.5 kPa and ±10 % accuracy from −5 to −100 kPa, it is the gold standard for irrigation scheduling and plant water-stress research connected to the yDoc ML-525 datalogger.
Key parameters
What the ND-TRS21 measures
Soil water potential
0 to −6553.5 kPa, calibrated −5 to −100 kPa
Plant-available water
Direct indicator — better than VWC for irrigation triggers
Soil temperature
–40 to +60 °C, ±1 °C accuracy
Direct integration
5 m cable to the yDoc ML-525 over SDI-12
Specifications
Technical specifications
Applications
Where the ND-TRS21 is used
Irrigation control
Trigger irrigation by what plants actually feel — matric potential, not just water content.
Smart agriculture
Crop water stress monitoring and decision support across heterogeneous fields.
Parks & landscapes
Right-size irrigation of urban trees and ornamentals — reduce water and runoff.
Golf courses
Match irrigation to actual turf stress level for premium playing surfaces.
Plant research
Soil water status data for crop physiology, breeding and ecological studies.
Integration
Powered by the yDoc ML-525 datalogger
The ND-TRS21 connects directly to the yDoc ML-525 datalogger. The yDoc powers the sensor, schedules measurements, stores readings locally and transmits them to the Sensor-Online platform via 4G/LTE-M, NB-IoT, LoRaWAN, satellite or Ethernet — with up to 10 years of battery life.
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FAQ
Frequently asked questions about the ND-TRS21
What does the ND-TRS21 measure?+
Why measure potential vs moisture content?+
When to use it for irrigation?+
Ready to deploy the ND-TRS21?
Get a quote, technical advice, or a complete bundle with the yDoc ML-525 datalogger and Sensor-Online platform subscription.