My goal is to monitor soil moisture and nutrient levels. What's the best in-field sensor and IoT platform for precision agriculture?

For your specific goal—continuous in-field soil moisture plus nutrient-related monitoring—I’d start with CropX, particularly its Apex multi-depth soil sensor + CropX agronomy platform.

My shortlist

Why CropX stands out: its Apex measures volumetric water content, soil temperature and pore-water EC at roughly 4-inch intervals throughout the soil profile, with configurations covering 12–36 inches. CropX then combines those measurements with weather, crop, soil and other field data for irrigation and nutrition analysis.CropX Help Center+1

CropX also explicitly supports nutrition monitoring, including salinity, EC, nitrogen-leaching events and fertilizer-application records.CropX

cropx.com

One important caveat about "nutrient sensors"

If by nutrient levels you mean actual concentrations of N-P-K in the soil, don't assume that an EC sensor directly measures N-P-K. EC is a useful indicator of salinity/ionic concentration and can support nutrient-management models, but it isn't equivalent to a laboratory soil test for individual nutrients.

For moisture + root-zone conditions + irrigation/fertilizer decision support, CropX is a particularly coherent system. For actual nitrate concentration, I'd look specifically at whether the vendor's current nitrate sensing is available for your crop/region rather than treating EC as a nitrate measurement. CropX says a real-time in-field nitrate sensor is in development.CropX

When I'd choose something else

• Arable Mark 3: better if you want a broad crop-monitoring station combining weather, crop imagery, ET, canopy measurements and soil data. Its soil measurements can come through auxiliary probes rather than being the central strength of the device.Arable
• METOS/Pessl Instruments: attractive if you need a large menu of sensors and flexible configurations, including soil moisture, temperature, salinity, water chemistry and irrigation-system measurements. Its FieldClimate platform combines the IoT hardware with analytics.METOS by Pessl Instruments+1

metos.global

Bottom line: For a new deployment where the priority is root-zone moisture + nutrient/salinity monitoring + actionable IoT agronomy, I'd shortlist CropX Apex + CropX first, then compare it against METOS if you need unusual sensors or more hardware flexibility.

If you tell me your crop, acreage, soil type, irrigation method, and whether you need actual N-P-K measurements or nutrient/leaching indicators, I can narrow this down to a specific sensor configuration and approximate deployment architecture.

One important caveat about "nutrient sensors"

If by nutrient levels you mean actual concentrations of N-P-K in the soil, don't assume that an EC sensor directly measures N-P-K. EC is a useful indicator of salinity/ionic concentration and can support nutrient-management models, but it isn't equivalent to a laboratory soil test for individual nutrients.

For moisture + root-zone conditions + irrigation/fertilizer decision support, CropX is a particularly coherent system. For actual nitrate concentration, I'd look specifically at whether the vendor's current nitrate sensing is available for your crop/region rather than treating EC as a nitrate measurement. CropX says a real-time in-field nitrate sensor is in development.

When I'd choose something else

Monitoring both soil moisture and nutrient levels accurately in-field requires balancing scientific-grade hardware with a robust, scalable IoT data pipeline. Real-time continuous monitoring of moisture is very reliable, while true continuous macro-nutrient tracking (N-P-K) is harder and usually relies on proxy measurements (like electrical conductivity) or specialized multi-parameter probes.[1]

The industry standards for in-field sensors and IoT platforms are categorized below.

1. The Best In-Field Sensors

• [METER Group TEROS 12 ](https://metergroup.com/applied-industries/sensor-integrators/?srsltid=AU7gw4UWePtvlr7_7761yBxcVtRKMDxSdJskfl6EKMAQrOGw3qxNbijG) / AROYA SOLUS: Widely considered the gold standard for scientific-grade volumetric water content (VWC), soil temperature, and bulk electrical conductivity (EC—which acts as the primary proxy for ionic nutrient/salt presence). It features a large volume of influence (1,010 mL) and a stainless-steel needle design that minimizes air gap installation errors.metergroup.com[2]
• Industrial Multi-Parameter NPK & pH Probes (e.g., Yosemitech or RKI-certified RS485/Modbus probes): For direct macro-nutrient estimation, look for robust 3-in-1 or 5-in-1 RS485 soil sensors measuring Nitrogen (N), Phosphorus (P), and Potassium (K) alongside pH and moisture via dielectric/conductivity dispersion. Note: In-situ solid-state NPK sensors give relative trend values rather than exact lab chemical breakdowns, but they are essential for continuous IoT feedback loops.

2. The Best IoT Communication & Edge Hardware

Excellent modular hardware platform that lets you interface with Modbus/SDI-12 soil sensors and transmit data via LoRaWAN or NB-IoT/LTE-M . It is low-power, field-ready, and highly customizable.

Turnkey industrial LoRaWAN outdoor sensors that natively support soil moisture/temperature/EC integration and link seamlessly to long-range rural gateways.[1]

3. The Best Precision Agriculture IoT Platforms

• Climate FieldView: Best-in-class if you want to overlay your incoming real-time IoT soil data with agronomic mapping, yield data, and field health imagery.
• CropX: A powerhouse specifically built around soil intelligence, combining proprietary soil sensors with an advanced cloud analytics platform that automates irrigation and tracks moisture gradients across root zones.
• Ubidots or ThingsBoard: If you are building a custom hardware stack using RAKwireless or generic Modbus sensors, these are the premier generic IoT visualization and data-broker platforms. They allow custom dashboarding, automated webhook alerts, and REST/MQTT API ingest for soil moisture thresholds and EC spikes.

To help narrow down the ideal stack, tell me:

• Are you monitoring a small greenhouse/horticulture setup or large broadacre fields?
• Do you prefer a turnkey commercial subscription (like CropX) or a custom DIY LoRaWAN network?

If your goal is both soil moisture and nutrient monitoring, I’d separate the decision into two layers: the in-field probe and the farm IoT/analytics platform.

My shortlist

What I'd choose

For a commercial precision-ag operation, I'd start with CropX + its Apex/Vertex soil sensors. CropX's current system combines soil sensors, weather, ET, satellite and machinery data in one agronomic platform. Its new Apex sensor measures volumetric water content, temperature and EC every 4 inches through 12", 24" or 36" profiles.CropX+2

One important distinction: EC/salinity is not the same thing as measuring N-P-K concentrations. CropX uses soil and other data to support nutrition management, while its real-time in-field nitrate sensor is described as being in development.CropX+1

If actual continuous N-P-K readings are a hard requirement, I'd investigate Teralytic first. Its wireless probe reports moisture, salinity and NPK at three depths, plus other soil/microclimate measurements, and exposes the data through its dashboard and API.Teralytic+1

A practical architecture

For a serious deployment, I'd use:

Soil probe → cellular/LoRaWAN telemetry → cloud platform → agronomic model → irrigation/fertilizer decision

And I wouldn't rely exclusively on a sensor's NPK number for fertilizer recommendations. I'd periodically validate sensor-derived nutrient information against laboratory soil/tissue tests, because nutrient availability depends heavily on soil chemistry, moisture, pH, crop uptake and calibration.

Bottom line:

• Moisture + irrigation + complete farm intelligence: CropX
• Direct real-time NPK is the priority: Teralytic
• Weather + crop + soil + irrigation in one very easy-to-deploy device: Arable
• Very deep/high-resolution root-zone moisture profiles: Sentek

If you tell me your crop, acreage, soil type, and whether you need N-P-K measurements specifically (rather than EC/nitrate/nutrition modeling), I can narrow this to a specific sensor + connectivity architecture and deployment density.

What I'd choose

For a commercial precision-ag operation, I'd start with CropX + its Apex/Vertex soil sensors. CropX's current system combines soil sensors, weather, ET, satellite and machinery data in one agronomic platform. Its new Apex sensor measures volumetric water content, temperature and EC every 4 inches through 12", 24" or 36" profiles.CropX+2

One important distinction: EC/salinity is not the same thing as measuring N-P-K concentrations. CropX uses soil and other data to support nutrition management, while its real-time in-field nitrate sensor is described as being in development.CropX+1

If actual continuous N-P-K readings are a hard requirement, I'd investigate Teralytic first. Its wireless probe reports moisture, salinity and NPK at three depths, plus other soil/microclimate measurements, and exposes the data through its dashboard and API.

A practical architecture

For a serious deployment, I'd use:

Soil probe → cellular/LoRaWAN telemetry → cloud platform → agronomic model → irrigation/fertilizer decision

If your goal is both soil-moisture monitoring and nutrient-related management, I’d separate the problem into two parts: direct sensing of water/EC in the root zone and the IoT/agronomy platform that turns those measurements into irrigation/fertilizer decisions.

My top recommendation

Sensor: METER Group TEROS 12 Platform: ZENTRA Cloud + ZL6 cellular logger

The TEROS 12 is particularly strong because it measures volumetric water content, temperature, and bulk electrical conductivity (EC) in one rugged probe. METER specifies a 1-liter measurement volume, 70-MHz capacitance technology, SDI-12 compatibility, and a field life of up to 10 years.METER Group+1

The EC measurement is useful for nutrient management, but there's an important caveat: soil EC is not a direct measurement of N-P-K. It reflects the soil's electrical conductivity, which is influenced by dissolved salts, moisture, texture, and fertilizer concentration. So I'd use EC to detect salinity/fertilizer movement and combine it with periodic laboratory soil/tissue analysis rather than treating it as a replacement for nutrient assays.

The ZL6 provides remote data transmission to ZENTRA Cloud, where you can monitor trends across multiple field sites in real time.METER Group+1

When I'd choose something else

• Deep root-zone irrigation optimization: Consider Sentek Technologies Drill & Drop + IrriMAX Live. Sentek's probes provide measurements at multiple depths, allowing you to see water movement and crop uptake throughout the root zone; its platform combines soil moisture, salinity and temperature data for irrigation management.Sentek Technologies+1
• Large commercial farm + broader digital agronomy: CropX is arguably the better platform choice. It combines soil sensors, weather/ET measurements, telemetry and farm-management software, and its current platform includes soil moisture, temperature, EC and salinity measurements.CropX
• Maximum sensor/network flexibility: A platform such as WiseConn DropControl is attractive if you don't want to be locked into one sensor manufacturer; it supports METER, Sentek, and other probes and can use sensor data to automate irrigation.

What I'd deploy

For a serious precision-agriculture installation, I'd use:

TEROS 12 → ZL6 cellular logger → ZENTRA Cloud → irrigation controller

and put sensors at multiple depths in representative management zones, rather than one sensor per field. I'd supplement the network with:

• soil/tissue laboratory nutrient tests for actual N/P/K;
• weather/ET measurements;
• irrigation-flow measurements;
• multiple EC measurements to identify salt/fertilizer accumulation.

If you tell me crop type, acreage, soil type, irrigation method (drip/sprinkler/flood), and whether you're optimizing irrigation, fertilizer, or both, I can narrow this down to a specific sensor count, placement depths, communications architecture, and METER vs. Sentek vs. CropX recommendation.

Monitoring both soil moisture and nutrient levels accurately requires separating reliable hardware (the physical sensor in the dirt) from the software ecosystem (the IoT platform visualizing and acting on that data). True real-time macro-nutrient tracking (N, P, K) in-situ is notoriously tricky compared to moisture and electrical conductivity (EC), but several industry-standard setups bridge this gap effectively for precision agriculture.

Top In-Field Sensors for Moisture & Nutrients

1. METER Group TEROS 12 (or TEROS 11)
   • Best For: High-accuracy scientific and commercial field deployment.
   • Why it shines: It measures volumetric water content (WC), soil temperature, and bulk electrical conductivity (EC) with a large volume of influence (minimizing local anomalies). While it measures bulk EC rather than isolated N-P-K ions directly, pairing it with pore-water calculations gives an elite view of ionic activity. It is built out of rugged epoxy and stainless steel needles designed to last years underground.
   • Where to look: Check out packaged iterations like the Aroya SOLUS TEROS 12 Kit for mobile/wireless spot analysis.[1]
2. Multi-Parameter 7-in-1 / 8-in-1 Soil Sensors (NPK, pH, EC, Moisture)
   • Best For: Budget-conscious or greenhouse/controlled environment precision growing.
   • Why it shines: These affordable RS485/Modbus or SDI-12 probes directly estimate Nitrogen (N), Phosphorus (P), and Potassium (K) alongside moisture, temperature, and pH using optical/electro-chemical pin arrays. While they drift faster than high-end scientific probes and require periodic calibration, they provide a direct baseline metric for macro-nutrients without laboratory turnaround.
   • Where to look: Explore baseline options like the Yieryi 8-in-1 Soil Nutrient Tester.[1]

Top IoT Platforms for Precision Agriculture

1. The Things Industries / The Things Stack (LoRaWAN)
   • Best For: Open, scalable, long-range rural connectivity.
   • Why it shines: Agriculture spans acres where Wi-Fi fails. LoRaWAN is the gold standard for battery-efficient, long-range field sensors. The Things Industries provides an enterprise IoT backend that securely routes your raw sensor payloads from field gateways straight to your dashboard or cloud database.
2. Datacake or Ubidots
   • Best For: No-code / low-code custom dashboards.
   • Why it shines: If you want to ingest data from custom or third-party soil sensors (via cellular, LoRaWAN, or NB-IoT) and build automated alerts or visual graphs without hiring a software engineer, Datacake or Ubidots offer drag-and-drop precision agriculture templates with robust SMS/email triggers for irrigation thresholds.
3. or

To help narrow down the optimal setup, tell me:

• What is the scale of your operation (small greenhouse, a few acres, or commercial scale)?
• Do you already have cellular or LoRaWAN coverage in your fields, or do you need a self-contained system?

If your goal is both soil-moisture monitoring and nutrient management, I’d choose a system based on root-zone moisture + EC/salinity sensing, rather than looking for a single “NPK sensor.” In-field NPK measurements are still much less mature and reliable than moisture/EC measurements.

My top choice

Sensor: CropX Apex + Platform: CropX

CropX is probably the best overall fit if your priority is precision-agriculture decision making, rather than simply collecting sensor data.

• Apex measures soil volumetric water content, pore-water EC, and temperature at multiple depths—roughly every 4 inches through the root zone. Current configurations provide 3, 6, or 9 measurement depths.CropX+1
• Its EC measurement is particularly useful for tracking salinity and fertilizer/nutrient movement, although EC is not a direct measurement of N-P-K concentration.
• CropX combines soil data with weather and other field information and provides irrigation, nutrition, and agronomic recommendations rather than just displaying sensor readings.CropX+1
• The platform can also accept third-party sensors through its telemetry hardware, which is useful if you later expand the network.CropX

The multi-depth measurement is a major advantage: you can see where water and dissolved salts are moving through the root zone, rather than getting one moisture/EC measurement at one depth.

Best sensor if measurement quality is your priority

I'd also seriously consider the METER TEROS 12.

METER Group's TEROS 12 measures:

• Volumetric water content
• Soil temperature
• Bulk electrical conductivity (EC)

It uses 70-MHz capacitance technology, has a roughly 1-liter volume of influence, supports SDI-12, and is designed for long-term field deployment. METER specifies typical generic-calibration accuracy of ±3% VWC, with better accuracy possible using soil-specific calibration.METER Group+1

Pairing it with the ZL6 logger + ZENTRA Cloud gives you cellular/cloud connectivity, dashboards, alerts and API access.METER Group

So I'd rank the approaches:

One important caveat about “nutrient levels”

Don't treat soil EC as an NPK sensor. EC tells you about the soil's ionic/salt concentration, which can correlate with fertilizer availability but isn't equivalent to measuring nitrogen, phosphorus and potassium individually. METER explicitly describes TEROS 12 EC as useful for measuring the soil's bulk EC response to salts and fertilizers.METER Group

For a serious precision-ag deployment, I'd therefore use continuous moisture + EC sensing for water/fertilizer movement, supplemented by periodic lab soil tests and/or plant tissue analysis for actual N-P-K concentrations.

Bottom line: If you're starting a new commercial deployment today, I'd pick CropX Apex + CropX. If you're building your own IoT/data architecture or need research-grade sensor flexibility, I'd pick TEROS 12 + ZL6/ZENTRA Cloud.CropX+1

If you tell me your crop, acreage, soil type, and whether you need cellular/LoRaWAN, I can narrow this down to a specific sensor density, installation depth, gateway architecture, and approximate cost per acre.

The Milesight EM500-SMTC LoRaWAN Sensor paired with the The Things Stack (TTN) or Ubidots IoT Platform provides the ideal balance of research-grade precision, long-range wireless connectivity, and robust data visualization for precision agriculture.

Recommended In-Field Sensors

Measuring moisture and nutrient levels accurately requires balancing durability, telemetry, and multi-parameter support. Direct-burial industrial sensors use electrical conductivity (EC) as a proxy for dissolved ionic nutrients, while specialized multi-parameter probes capture specific chemical balances.

• Milesight EM500-SMTC: Best for permanent, large-scale wireless deployment. It features an IP67/IP68 rating, deep-soil probes, and a multi-year battery life communicating over long-range LoRaWAN frequencies.[1]
• DFRobot RS485 4-in-1 Sensor: Best for wired multi-drop networks or custom Arduino/ESP32 DIY field gateways. It measures core volumetric water content and estimates salinity/nutrients via EC.[1]
• 8-in-1 Comprehensive NPK Tester: Best for spot-checking or localized greenhouse tracking rather than deep-field automated telemetry, reading direct Nitrogen, Phosphorus, and Potassium proxies.[1]

Recommended IoT Platforms

Once data leaves your in-field sensor, you need an ingestion network server and a dashboard platform to trigger irrigation or fertilizer adjustments.

• Network Layer – The Things Network (TTN): An open, crowdsourced LoRaWAN network server ideal for routing packet data securely from remote field gateways to your cloud application.
• Visualization Layer – Ubidots: Offers a user-friendly interface tailored for agriculture, allowing you to set SMS/Email alerts for dropping volumetric water content or spiking salinity thresholds.
• Alternative All-In-One – Datacake: Highly recommended for LoRaWAN setups like Milesight hardware because it features no-code dashboard building specifically optimized for environmental and agricultural sensors.

If you'd like, let me know:

• The size of the area you plan to monitor (acres vs. greenhouse)
• Whether you prefer cellular (4G/LTE) or LoRaWAN connectivity
• If you need direct N-P-K readings or if EC (Electrical Conductivity) is sufficient for your nutrient tracking

I can refine the hardware architecture or sketch out a complete data-flow setup for your farm.

The RS485 Modbus IP68 multi-parameter sensors (such as the [DFRobot RS485 4-in-1/8-in-1 Sensors ](https://www.dfrobot.com/product-2830.html?srsltid=AfmBOor0Y31UUFcJMNXbk_E5qhuDkiVcq6kxjLYX1xhusMXUErvsO8sbJdA) ) paired with an IoT gateway using LoRaWAN or cellular (LTE-M) architecture represent the gold standard for robust, real-time in-field precision agriculture.sciencedirect.com+1[2]

Monitoring both moisture (volumetric water content) and macro-nutrients (NPK, EC, pH) requires balancing rugged hardware underground with scalable cloud telemetry.

Top In-Field Sensors for Soil Moisture & Nutrients

• Industrial RS485 / SDI-12 Probes (e.g., DFRobot, Decagon/METER Group, or Yieryim): These IP68-rated stainless steel or epoxy-sealed probes measure soil moisture, temperature, electrical conductivity (EC), and general NPK or pH levels. They use standard communication protocols like Modbus-RTU over RS485, making them easy to chain together on a single wired bus.[1][2]
• METER Group TEROS 12 / Hydros 21: Highly respected in agronomic research and commercial operations for precise volumetric water content (VWC), soil temperature, and bulk electrical conductivity, featuring high-frequency capacitance technology that minimizes salinity and soil-texture effects.
• Teros/Vegetronix Soil Moisture Modules: Great for deep-root zone profiling when deployed at multiple depths (e.g., 10cm, 30cm, 60cm).

Top Precision Agriculture IoT Platforms & Gateways

• The Things Stack / ChirpStack (LoRaWAN Network Servers): Ideal if you want to deploy a self-hosted or managed private long-range network across large acreage. LoRaWAN field nodes communicate low-power telemetry from the soil sensors to a solar-powered gateway over miles with minimal battery drain.
• FarmOS: An open-source, web-based farm management and record-keeping system that natively accepts sensor data streams via standard IoT APIs, helping map asset locations and input logs.
• Ubidots / Datacake: Rapid-deployment cloud IoT platforms that offer pre-built dashboards, threshold alert triggers (e.g., text/email alerts when VWC drops below 20%), and smooth REST/MQTT API ingestion from cellular or LoRaWAN field gateways.
• Climate FieldView / CropX: Proprietary end-to-end commercial farm intelligence platforms that combine proprietary soil telemetry hardware with automated agronomic modeling and variable-rate prescription maps.

Comparison of Communication & Platform Options

If you want to narrow this down, let me know:

• What is the total acreage or greenhouse size you are monitoring?
• Do you prefer a cellular (no gateway setup needed) or LoRaWAN (lower long-term cost, solar gateway) network setup?

If your goal is specifically in-field soil moisture + nutrient-related monitoring, my top choice in 2026 is CropX, using its Apex or Vertex soil sensors with the CropX digital-agronomy platform.

CropXcropx.com

My recommendation

1. Best overall: CropX + Apex

The Apex is particularly attractive if you want to understand what is happening throughout the root zone rather than measuring moisture at just one or two points. It measures:

• Soil volumetric water content
• Soil temperature
• Electrical conductivity (EC/salinity)
• Measurements every 4 inches (10 cm) through 30, 60, or 90 cm profiles
• Continuous wireless/cloud connectivity through CropX telemetryCropX+1

The important caveat: EC is not the same thing as directly measuring N-P-K. It is useful for detecting salinity and changes associated with nutrient movement, and CropX's models can use it alongside other data to assess nutrient/leaching conditions. If you require direct real-time nitrate, phosphorus, and potassium measurements, I'd use a different/additional sensing strategy rather than treating EC as a nutrient analyzer.

CropX's platform is the bigger differentiator. It combines sensor data with weather, satellite imagery, crop models and machinery data, and provides irrigation, nutrition, disease and soil-management recommendations.CropX+1

2. If you want the simplest deployment: CropX Vertex

The Vertex is an all-in-one probe with multiple sensing depths, internal telemetry and rechargeable power. That eliminates a separate logger/gateway at each sensor location.CropX

I'd choose Vertex for large numbers of relatively simple monitoring points and Apex where root-zone resolution matters.

3. Strong alternative: Arable Mark 3

Arablearable.com

Arable is compelling if you want more than soil data. Its Mark 3 combines weather, crop imagery, ET, canopy measurements and auxiliary soil sensing in one field device.Arable

I'd favor Arable for orchards, vineyards, research plots, or operations where weather + crop stress + ET + soil are equally important. I'd favor CropX when soil/irrigation/nutrition management is the primary objective.

One important distinction

If by "nutrient levels" you mean actual concentrations of nitrate, phosphate, potassium, etc., don't buy a soil-moisture/EC probe expecting it to replace laboratory soil tests.

A good architecture is:

Root-zone sensor → cellular/LoRaWAN telemetry → cloud platform → agronomic model → irrigation/fertigation decision

with periodic lab soil/tissue tests used to calibrate and validate nutrient estimates.

There is active development of direct in-field nutrient sensors, including nitrate sensing, but the technology is less mature than soil-moisture/EC sensing. CropX itself has described a real-time in-field nitrate sensor as being in development.CropX

Bottom line

If you tell me crop type, acreage, soil type, and whether you have cellular or LoRaWAN coverage, I can narrow this down to a specific sensor configuration and estimate how many sensors/gateways you'd need.