Drone vs. Ground Rig: Wheel Tracks, Wet Fields & the Real Math
By Ag Drone Sprayers Editorial Team · Updated July 3, 2026
Per acre, a ground rig looks like the cheapest way to spray — and on short crops and dry ground, it usually is. The comparison changes when the corn is at tassel, the field is wet, or the sprayer would spend half the day turning around point rows. Then the “cheap” pass starts costing bushels, and a spray drone earns its rate.
The costs the rig hides
- Wheel-track trampling.Extension estimates commonly put wheel tracks at roughly 1–3% of the standing crop depending on boom width and row spacing. In tall corn that strip is gone. On 200-bushel corn, ~2% is about 4 bu/ac — real money at any price.
- Compaction.A loaded sprayer can weigh 15–25 tons. Every wet-field pass costs yield in future seasons, not just this one.
- Stuck days.The rig sprays when the ground carries it. Disease doesn’t wait for the field to dry — and a missed fungicide window can cost far more than the application.
What the drone changes
A spray drone flies over the crop: zero wheel tracks, zero compaction, and wet ground doesn’t matter. It launches from the field edge, covers awkward shapes without turning damage, and works the tall-crop passes — tassel fungicide above all — where a rig with drops is slow and destructive. The trade-off is capacity: drones carry 10–15 gallons and typically apply at 2–5 GPA, so high-volume passes (burndown, liquid N) stay with the rig.
The honest math
Say drone application quotes $15/acand your own rig pass pencils at $8/ac in fuel, labor, and depreciation. On tasseled corn, add the rig’s trampling loss — call it 4 bu/ac at $4.50 corn, about $18/ac — and the drone is cheaper before you count compaction or the risk of waiting on a wet field. On short beans in June, the rig keeps winning. That’s the pattern: the taller the crop and the wetter the year, the better the drone pencils. Run your own numbers with the cost calculator.
When to book which
- Ground rig: burndown, pre-emerge, early post passes, high-GPA liquid fertilizer, dry fields, short crops.
- Drone: tassel-stage fungicide, wet springs and falls, small or irregular fields, rescue insecticide, cover-crop seeding into standing crop, anything where wheel tracks hurt.
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Frequently asked questions
- How much crop do sprayer wheel tracks destroy?
- University extension work commonly estimates ground-rig wheel tracks run over roughly 1–3% of a standing crop, depending on boom width and row spacing — in tall corn at tassel that trampled strip doesn't recover. On 200 bu/ac corn, losing ~2% is about 4 bushels an acre before you count compaction. Aerial application, drone or plane, takes that loss to zero.
- When is a ground rig still the right call?
- Early-season passes on short crops, high-GPA applications like burndown or liquid fertilizer, and any time the field is dry, the crop is short, and your own rig is already paid for. The drone case gets strong when the crop is tall, the ground is wet, or the field is small and awkward.
- Can a drone replace my sprayer entirely?
- For most row-crop operations, no — think of the drone as the tool for the passes the rig does badly: tassel-stage fungicide, wet springs, small or irregular fields, and rescue treatments. Many farms run both.