Water is becoming one of the most precious resources in the UK and globally. For farmers, groundskeepers, and facility managers, the days of relying on intuition or rigid watering schedules are numbered. The pressure to reduce water usage while maintaining crop yields and pristine landscapes is driving a technological shift towards “Precision Irrigation.”
At the heart of this revolution is a small, rugged device: the LoRaWAN Soil Moisture Sensor.
Historically, monitoring soil moisture meant manually driving to a field, digging a sample, or relying on expensive wired probes that were vulnerable to machinery damage. Today, the Internet of Things (IoT) has removed the wires and the guesswork. By deploying long-range, battery-powered sensors, land managers can visualise the exact hydration levels of their soil in real-time, from anywhere in the world.
This guide explores how LoRaWAN soil moisture sensors work, why they are superior to traditional methods, and how they are helping Concept13 clients save water and labour.
The Quick Answer
What is a LoRaWAN soil moisture sensor? It is a wireless device that measures the Volumetric Water Content (VWC) of soil and transmits the data over a LoRaWAN network to a central dashboard. Unlike Wi-Fi or Bluetooth sensors, which have short ranges, LoRaWAN sensors can transmit data over several miles, penetrating dense crops and soil. They allow farmers and groundskeepers to see exactly when plants need water, preventing the waste of over-watering and the stress of under-watering. This data-driven approach typically reduces water consumption by 20–30% while improving plant health.
The Problem: The Cost of Guesswork
In agriculture and landscaping, water management has traditionally been an art rather than a science. This leads to two expensive problems:
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Over-watering (Waterlogging): Applying too much water not only wastes a valuable resource but can also suffocate plant roots, encourage fungal diseases like root rot, and leach expensive fertilisers into the groundwater before plants can absorb them.
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Under-watering (Stress): Waiting until a plant looks wilted means damage has already occurred. Water stress stunts growth, reduces crop yield, and ruins the playability of sports surfaces like golf greens and football pitches.
Without data, you are essentially driving blind. You might water a field because the surface looks dry, unaware that the root zone 30cm down is perfectly hydrated.
The Solution: Why LoRaWAN?
Why choose LoRaWAN over other wireless technologies like 4G, NB-IoT, or Wi-Fi?
1. Incredible Range
Agricultural environments are vast. A Wi-Fi signal struggles to reach the end of a garden, let alone a 50-acre field. LoRaWAN (Long Range Wide Area Network) is designed for distance. A single LoRaWAN Gateway can receive data from sensors up to 10 miles (15km) away in open rural areas. This allows a single gateway to cover an entire farm or golf course.
2. Battery Longevity
Running power cables to the middle of a field is impossible. Changing batteries every month is impractical. LoRaWAN sensors consume tiny amounts of energy. A high-quality soil sensor can operate for 5 to 10 years on a single battery, transmitting data once an hour. This “fit and forget” reliability is essential for large-scale deployment.
3. Penetration
Radio signals struggle to pass through water and dense vegetation (the “maize moisture” effect). LoRaWAN operates on a sub-gigahertz frequency (868 MHz in the UK), which offers excellent penetration characteristics, ensuring reliable data transmission even when the crop canopy is thick.
How It Works: Capacitive vs. Resistive
Not all sensors are created equal. At Concept13, we recommend industrial-grade Capacitive Sensors for professional applications.
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Resistive Sensors (Avoid): These measure moisture by passing an electrical current through the soil between two prongs. The problem is that this current causes the prongs to corrode (electrolysis) rapidly. They are cheap but fail quickly.
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Capacitive Sensors (Recommended): These measure the change in the soil’s dielectric constant (its ability to hold an electrical charge). The metal probes are completely sealed inside the casing, meaning there is no exposed metal to corrode. They are robust, durable, and unaffected by the salinity (salt content) of the soil, making them ideal for long-term burial.
Use Cases: From Farm to Fairway
Precision Agriculture
Farmers use these sensors to implement “Variable Rate Irrigation.” By placing sensors at different depths (e.g., 30cm, 60cm, and 90cm), they can see exactly where the active root zone is drinking. If the sensor at 60cm shows high moisture, they know they can skip an irrigation cycle even if the surface is dry. This preserves Soil Health and maximises yield.
Smart Cities and Parks
Municipal councils are under pressure to keep green spaces lush while cutting costs. Sensors installed in public parks and roundabouts alert maintenance teams only when watering is actually needed. This eliminates the sight of sprinklers running during a rain shower—a common public grievance.
Sports Turf Management
For golf courses and football stadiums, the firmness of the ground is as important as the grass’s health. Soil sensors help groundskeepers maintain the perfect balance of moisture for playability, preventing the pitch from becoming too soft (muddy) or too hard (dangerous for players).
Data Visualisation: Seeing the Invisible
The true power of the sensor lies in the data. Modern IoT Platforms visualise VWC as a simple percentage.
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Saturation Point: The soil cannot hold any more water.
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Field Capacity: The ideal state where water remains in the soil against gravity.
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Wilting Point: The danger zone where plants can no longer extract water.
By setting alerts on your dashboard, you receive a text or email the moment your soil approaches the “Wilting Point,” allowing you to irrigate just in time.
Conclusion
The adoption of LoRaWAN soil moisture sensors represents a shift from reactive to proactive land management. It is a technology that pays for itself rapidly – not just in the reduction of water bills, but in the labour saved from manual checking and the increased value of a healthier crop or landscape.
Whether you are managing a vineyard in Sussex or a cricket pitch in Yorkshire, the data exists in the ground beneath your feet. LoRaWAN simply gives you the power to read it.
To explore how wireless soil monitoring can benefit your site, browse our range of LoRaWAN Sensors or contact the Concept13 technical team for a consultation.
