Soil Water Potential
The measurement of soil water potential reflects the availability of water within the soil, and the ease that the plant can draw upon that water. By using the tensiometer, the soil water potential can be measured using proven ceramic technologies. The TM7 Tensiometer provides an absolute measurement of soil water potential using sensor-based technologies.
ICT International offer solutions for the continuous measurement of the soil water potential connected with an IoT-capable datalogger. When connected to the online Dataview platform, any calculations required are performed in the cloud using metadata from the sensors and data logger, requiring minimal input from the user.
Sensor combinations are built around two tiers of products, providing increasingly responsive and accurate solutions, culminating in a system that provides data that is suitable for detailed scientific study of plant water relations.
| Parameter | Tier 1 (Good)
Indicative / Observation |
Tier 3 (Best)
Research / Benchmark |
| Plant Water Stress | Tensiometer | Tensiomark TM7 |
| Power system | LP | LP |
| Part Number | SWP-T1 | SWP-T2 |
Soil Water Potential
About the Soil Water Potential Stations:
All systems are built upon the ICT International Datalogger, which is optimised for the online Dataview data handling platform. Providing an all-in-one datalogger, with power management and data handling, the datalogger platform is expandable with optional communication and sensor expansion modules
| Â | Tier 1 (Good)
Indicative / Observation |
Tier 3 (Best)
Research / Benchmark |
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| Part Number | SWP-T1 | SWP-T3 | ||||
| Parameter | Sensor | Range / Accuracy / Detail | Value | Sensor | Range / Accuracy / Detail | Value |
| Soil | Tensiometer | Measuring Range | +100kPa to -100kPa | TM7 | Measuring Range | 1-1,000 mPa (pF 0 to pF 7.0) |
| Resolution | 0.1 kPa | Resolution | 0.01 pF | |||
| Accuracy | ±1.0% span | Accuracy | +/- 30 hPa & 5 % FS = 0,35 pF | |||
| Power system | LP | Solar Panel | 10W | LP | Solar Panel | 10W |
| Battery | 6,000mAh LiPO4 | Battery | 6,000mAh LiPO4 | |||
Data
The Soil Water Potential Station measures the following parameters which can be visualised in the online Dataview platform:
| Part Number | PWP-T1 | PWP-T2 |
| Soil Water Potential | In megapascals (mPa), calculated from the 4-20mA pressure transducer | In pF and converted to megapascals (mPa) |
| Soil Temperature | Yes | |
| Geolocation | Accurate to 5 decimal places (approximately 1.11 metres, depending on installation conditions) | Accurate to 5 decimal places (approximately 1.11 metres, depending on installation conditions) |
Tier 1 Sensors (SWP-T1):
The Tier 1 system is based on:
- Tensiometer: Providing measurements of the soil water potential, available in various lengths, the tensiometer measures the __________ that water can move through the soil.
- Power System: Supplied with the Low Power system containing a 10-watt solar panel and matching mount, and an internal 6,000mAh battery. The power system can be expanded with a supplementary 10-watt solar panel and mount to provide additional charge when used in low light conditions (EP-L).
Tier 3 Sensors (SWP-T3):
The Tier 3 system is ideal for the detailed analysis of soil water responses
- TM7 Tensiomark: An SDI-12 sensor that measures the soil water potential, the TM7 is a low maintenance sensor that is ideal for installation as part of a SPAC monitoring system for the absolute measurement of water potential.
- Power System: Supplied with the Low Power system containing a 10-watt solar panel and matching mount, and an internal 6,000mAh battery. The power system can be expanded with a supplementary 10-watt solar panel and mount to provide additional charge when used in low light conditions (EP-L).
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