Drone Granular Spreading vs a Custom Aerial Applicator

Throughput is the aeroplane's argument and it is a strong one. A loaded ag plane covers dramatically more ground per hour than any drone, and the gap is not close. It flies far wider swaths at far higher speed and carries a payload measured in a scale no multirotor approaches. For reference at the other end, the site's own ROI calculator works from 65 acres per hour for the largest Agras platform. An aircraft's figure lives in a different bracket entirely.

So if the problem statement is "a very large number of acres has to be covered before the weather turns," the aircraft wins on arithmetic alone and no amount of enthusiasm about drones changes it. Be honest about that up front, because a drone operator who pretends otherwise is not worth hiring.

Staging and ferry distance is the drone's argument. An aircraft needs a suitable strip or landing site and a loading setup, and every minute spent flying between that site and your field is a minute not spent applying product. When the staging site is close and the acres are many, that overhead disappears into the job. When the field is far from any strip, or the job is small, the ferry becomes a large share of the work.

A drone has almost no ferry. The truck parks on the headland, the aircraft takes off within sight of the work, and the round trip to reload is measured in metres. That is why a drone can serve a single isolated quarter economically when getting an aircraft there would cost more in positioning than in application.

Field size and shape is where the two genuinely diverge. An aeroplane is efficient in proportion to how much uninterrupted straight line it gets. Long runs in open country are ideal. Turnarounds are dead time, so a field that is all corners burns the advantage away.

Central Alberta parkland is not ideal country for that. Quarters get broken up by sloughs, bush margins, shelterbelts, creek crossings, and yard sites, and the resulting shapes have more edge than area. A drone does not care: it flies the boundary you give it, turns in its own length, and works a twenty-acre irregular piece with the same efficiency per acre as a square one.

Obstacles decide more jobs than people expect. Powerlines, pivots, yard sites, wind turbines, treed margins, and tight approaches all constrain a fixed-wing pass and some of them rule it out. A helicopter handles a lot of this better than a plane does, which is part of why helicopter time costs what it costs.

A drone flies low and slow with obstacle sensing, holds position, and works right up to a shelterbelt or around a pivot point. On a field where the awkward ground is a meaningful share of the acres rather than a rounding error, that difference is the whole job.

Minimum acres, and the small-field reality. Both services carry minimums, because mobilising anything has a fixed cost that does not care about your acre count. The aircraft's minimum is larger, and reasonably so — positioning an aeroplane and a loading operation is a bigger commitment than driving a truck to a headland.

The practical consequence: there is a band of small and scattered parcels that a custom aerial applicator will decline or price as a favour, and those parcels are straightforwardly normal work for a drone. If your farm is one home block plus five outlying pieces in three municipalities, that pattern matters more to your total cost than the per-acre rate does. The quote article covers how mobilisation gets counted.

Prescription resolution, stated fairly. Variable-rate application is not a drone-only capability, and anyone implying that is overselling. Modern ag aircraft can and do vary rate across a field.

The honest difference is achievable resolution. Zone resolution is bounded by swath width and ground speed: a wide, fast swath cannot change rate over a short distance, while a narrow, slow one can. So a prescription map with small management zones — the kind that comes out of NDVI work and zone soil sampling on variable parkland ground — is honoured more closely by a drone. On a field whose real variation is broad and gradual, the aircraft's resolution is entirely adequate and the distinction is academic.

Calibration is a question for both. A spreader's spec-sheet swath is not the swath your product throws, whichever machine is throwing it. Prill size, product density, rate, and height all move the deposition curve, which is why a pan test is what sets the effective swath actually flown. Ask either operator whether they calibrate for your specific product.

Scheduling is two different queues. In peak season a good custom aerial applicator is booked solid, and that is not a criticism — it is what being good looks like. But it means your place in the line is set by everyone else's timing needs as well as yours, and the weather days that suit your field suit every other field too.

Drone capacity is a separate queue with different bottlenecks. Sometimes that means a drone can get to your field in the window where the plane cannot, and that is a scheduling advantage rather than a technical one. On a top-dress pass where hitting the uptake window is the entire point, availability can outweigh throughput, which is the same logic covered in the wet ground and tall crop article.

Documentation. Both should return a record. A drone pass produces a georeferenced as-applied map as a by-product of how it flies, showing where product landed at what rate on what date. Aircraft record coverage too; what varies is the format you get it in and how quickly. Either way, ask what the deliverable is and insist it is named in the quote, because that file is your documentation for a program claim and your baseline for next year.

Authorization, for both, and the pesticide question kept separate. A custom aerial applicator operates licensed commercial aircraft with certified pilots under a long-established framework. A drone dispensing operation in Canada requires a Transport Canada SFOC that names the aircraft and the pilots, plus current RPAS pilot certification and liability insurance. Ask to see the relevant paperwork from whoever you hire. It is a routine request.

Granular fertilizer and seed spreading is the everyday legal drone service and the subject of this comparison. Pesticide application sits under a narrower and newer pathway: in June 2026 Health Canada's PMRA issued an interim Letter of No Objection permitting drone application of pesticides already registered for conventional aerial application, under those label directions, where the registrant has not opted out. Transport Canada authorization and provincial applicator licensing still apply, and products without aerial label directions are not covered. Custom aerial applicators have long operated under the conventional aerial registrations that pathway refers back to, so on a spray job the comparison is a different one with different licensing questions.

The decision table

On cost. The site's published reference points are the Alberta custom application range of roughly 10 to 15 dollars per acre and a drone operating cost of about 4.50 dollars per acre in the ROI calculator. Those are reference points, not a quote for your field, and they are not directly comparable to a custom aerial rate for a different product at a different volume.

The more useful observation is that on the acres where each method is clearly the right tool, cost is rarely what decides it. Nobody flies a drone over a wide-open half section because it is cheaper, and nobody mobilises an aeroplane for twenty-two broken acres beside a yard site because it is cheaper. Access, timing, and field shape do the deciding, and the cost follows the choice rather than driving it.