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Agricultural drones are transforming farming, and the opportunity is enormous. From crop monitoring to precision spraying, from pest detection to topographic mapping, drones for agriculture allow you to do in hours what previously took days. In this guide, I explain how they work, how much they cost, what regulations allow (and prohibit) and how to get started.
7 Applications of Drones in Agriculture
1. Crop Monitoring and Mapping
RGB imagery supports visual inspection and mapping. Vegetation indices such as NDVI require appropriate spectral bands and calibrated processing. Flight time and coverage depend on the sensor, altitude, overlap, terrain and mission plan; field observations are needed to interpret results.
2. Precision Spraying
DJI reports a 40 kg spraying payload for the Agras T50 and a tested field-operation rate of 21 hectares per hour. That manufacturer result is not a guaranteed rate for every crop or application. Wind, dose, refilling and field layout change the result. DJI test information.
In Portugal, pesticide application by drone is subject to the DGAV prohibition discussed below. Aircraft capability is not permission to spray.
3. Pest and Disease Detection
Changes in crop imagery can help identify areas needing inspection. A vegetation-index change is not a diagnosis of a particular pest or disease. Check findings on the ground with an agronomist before deciding on treatment.
4. Soil and Topography Analysis
Photogrammetry and LiDAR can support terrain mapping, drainage and irrigation planning. Survey accuracy depends on the sensor, positioning, ground control, vegetation and processing; a drone alone does not guarantee centimetre accuracy.
5. Counting and Inventory
Image-processing tools can assist tree counting and inventory. Validate the results against field samples: canopy overlap, shadows and image resolution affect accuracy. Coverage and processing time must be estimated for the actual mission.
6. Precision Irrigation
Thermal cameras mounted on drones detect temperature variations in soil and plants, identifying zones under water stress. Combined with smart irrigation systems, it allows watering only where needed.
7. Drone Seeding
Seeding drones disperse seeds, fertilisers and reforestation agents in hard-to-access areas: slopes, burned zones, irregular terrain. Several companies already offer this service across Europe.
Best Agricultural Drones in 2026
Compare the equipment with the task and local permissions. These are examples with manufacturer documentation, rather than a ranking from comparative field tests. Specifications checked on 2 October 2026.
| Model | Verified specification | Source |
|---|---|---|
| DJI Agras T25 | 20 kg maximum spraying payload | DJI |
| DJI Agras T50 | 40 kg spraying payload; manufacturer-tested 21 ha/h | DJI |
| DJI Agras T100 | 100 L tank; up to 100 kg spraying payload in standard configuration | DJI specs |
| DJI Mavic 3M | RGB and multispectral cameras for crop surveying | DJI specs |
Tank volume and payload mass are different limits. The T100 dual-battery spraying configuration has a lower rated payload than the standard configuration. Confirm the exact package before purchase.
How Much Does an Agricultural Drone Cost?
Request a quote for the complete operating system, not only the aircraft. Compare these cost groups:
- Aircraft, required sensors and mounting hardware.
- Batteries, charging system, transport and spares.
- Software subscriptions, processing and agronomic interpretation.
- Pilot training, permissions, insurance and maintenance.
- For a service quote: travel, minimum job size, survey area and deliverables.
Confirm currency, taxes, package contents and regional availability. No current comparable quotations were available to support the previous price ranges.
Return on Investment
Calculate the business case using your own field data. Record the current survey cost, proposed flight and processing cost, usable outputs and any measured changes in farm decisions. Include training, repairs, batteries and downtime.
There is no defensible universal percentage saving or number of harvests to break even. A pilot project should establish whether the information changes decisions enough to justify the total cost. In Portugal, do not base the calculation on pesticide spraying that lacks lawful approval.
Regulations for Agricultural Drones
Open-category eligibility depends on more than aircraft mass: class or legacy status, pilot competency, flight height, separation and visual line of sight also matter. Dropping material is outside the open category. EASA open-category conditions.
The specific category normally requires operational authorisation unless an applicable standard scenario or LUC privilege provides another route. Training, risk assessment and operational conditions depend on that route. EASA specific-category guidance.
Aviation approval does not override agricultural law. In Portugal, confirm plant-protection-product restrictions with DGAV before planning any application. For monitoring, consult the Portugal drone-laws guide.
Frequently Asked Questions
How much does a drone for agriculture cost?
The budget depends on whether you need visual inspection, calibrated multispectral measurements or material application. Request itemised quotes for the aircraft, sensors, batteries, software, training and operation. Service prices also depend on the task and site; unsupported price ranges are not reliable quotes.
Is it legal to spray with drones?
In Portugal, aerial application of plant-protection products is generally prohibited. DGAV explicitly includes drones in that prohibition. Do not treat aviation authorisation as permission to apply pesticides; confirm the current agricultural rules with DGAV before planning any operation. Other countries have their own requirements. Source: DGAV.
What is the best drone for crop monitoring?
Choose sensors for the agronomic question. RGB imagery supports visual inspection; multispectral analysis needs suitable calibrated sensors and processing. DJI Mavic 3M is an example combining RGB and multispectral cameras. A large drone platform does not by itself establish sensor suitability. Manufacturer specifications.
Do I need a special licence for agricultural drones?
An aircraft below 25 kg is not automatically eligible for open-category operation. You must also meet the applicable class, distance, height, visual-line-of-sight, registration and training conditions. Dropping material falls outside the open category; aviation permissions do not override pesticide restrictions. Source: EASA.
Conclusion
Drones for agriculture represent one of the greatest modernisation opportunities for the farming sector. From crop monitoring with multispectral cameras to precision spraying, the technology is mature and accessible.
To get started, I recommend beginning with monitoring using a quality consumer drone (like those listed in our best drones guide) and evolving to more specialised solutions as needed.
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