A lot of New Zealand farms have land that doesn’t get treated properly. Not because farmers don’t know it needs doing – but because getting product onto steep faces, soft paddocks, or broken country is genuinely difficult with conventional equipment.
Trucks and ground sprayers need stable footing and reasonable gradients. Helicopters work, but the economics often don’t for smaller areas. So the land gets skipped, or treated inconsistently, or left until conditions allow – which they sometimes don’t.
Drone spraying was built for exactly this kind of terrain. Here’s how it works and when it makes sense. If you’re weighing it up against a helicopter for the same job, start with how drone spraying compares to helicopter spraying.
How does a drone handle steep terrain?
A spraying drone operates on a pre-programmed GPS flight path. It doesn’t travel along the ground – it flies above the surface at a set height, maintaining consistent altitude relative to the terrain below it as it goes.
That means gradient isn’t a constraint. A 45-degree face is the same to the drone as flat paddock. The application rate stays consistent, the coverage stays even, and the operator stays on the ground throughout.
Modern agricultural drones use terrain-following technology, adjusting altitude in real time to account for changes in ground level. The result is consistent application height across the treatment area regardless of what the land beneath is doing.
What about wet or soft ground?
The drone doesn’t touch the ground. There’s no vehicle weight, no wheel pressure, no tracks to leave ruts.
For paddocks that are too wet to carry machinery safely after rain, or low-lying areas that stay soft well into spring, drone spraying removes the timing constraint. You’re not waiting for the ground to firm up before you can treat – you’re treating when the weed pressure or disease risk says it needs doing, not when the ground will tolerate a vehicle.
This matters particularly for:
Wet winter paddocks. Areas that can’t carry a sprayer in July or August without leaving damage that takes the rest of the season to recover.
Low-lying or poorly drained ground. Permanently soft areas that conventional equipment avoids as a rule, leaving weed populations to establish and spread.
Post-rain windows. Sometimes the best time to spray is in the break after rain when weeds are actively growing. If the ground won’t carry equipment, that window closes. A drone can work through it.
What about broken or hard-to-access terrain?
Steep is one challenge. Access is another. Some land is difficult to treat not because of gradient but because getting to it requires crossing terrain that’s impractical or risky for ground equipment.
A drone needs a clear area to take off and land, line of sight from the operator, and enough airspace to operate safely. It doesn’t need a track, a gate, or a route through the farm. If the operator can see the treatment area and position themselves safely, the drone can reach it.
This opens up land that often gets written off: faces on the far side of a gully, slopes behind shelter belts, areas accessible only through paddocks that can’t be driven across in certain conditions.
Does the application work as well as other methods?
On steep or wet terrain where the alternative is a helicopter, the comparison is broadly favourable. GPS-guided application means coverage is consistent and logged. There’s no drift from excess speed on a face, and no variation in application rate from terrain that limits a pilot’s control.
On flat, accessible ground against a well-maintained ground sprayer, throughput is lower. Drone spraying is not trying to compete with ground equipment on terrain that suits ground equipment. It’s for the land that doesn’t.
For steep country in particular, the question isn’t whether drone spraying is as good as a ground sprayer on flat land – it’s whether it’s better than the realistic alternative for that terrain. In most cases, it is.
What products can be applied?
Drone spraying is suitable for herbicides, fungicides, and other approved agricultural chemicals. Product selection, mix rates, and application requirements are the same as any registered application method – the drone is the delivery mechanism, not a different chemistry.
Any operator working under the DroneBoss network is certified to carry out commercial chemical application. Check that any operator you engage holds the appropriate CAA certification and has the relevant agricultural chemical handling credentials.
Is drone spraying the right call for your block?
Is the terrain limiting what you can currently treat? If there are areas of your farm that consistently get skipped because the ground conditions or gradient rule out your normal approach, drone spraying is worth looking at.
Are you losing ground to weed or disease pressure on difficult terrain? The cost of leaving areas untreated compounds over time. If the issue is access, the maths on a drone job often look different when you factor in what you’re losing by not treating.
What’s the realistic alternative? For smaller areas or isolated blocks, helicopter economics may not work. For terrain that rules out ground equipment, there may be no realistic alternative at all.
Drone spraying isn’t the answer for every block or every job. But for steep faces, wet paddocks, broken country, and the land that conventional equipment skips – it’s a practical option worth a conversation.
Get a straight answer for your property
DroneBoss connects you with qualified drone operators across New Zealand for agricultural spraying, fertiliser spreading, and building wash.
If you’ve got difficult terrain that isn’t getting treated the way it should be, get in touch. We’ll tell you what’s possible.
Request a quote or call 0800 DRONEBOSS.
Frequently asked questions
Can a drone spray on steep hills?
Yes. Spraying drones operate on a GPS flight path above the surface and maintain consistent application height regardless of gradient. Slope is not a constraint.
Can drones spray wet or waterlogged ground?
Yes. The drone doesn’t touch the ground, so there’s no vehicle pressure and no compaction risk. Wet or soft ground that won’t carry machinery safely can still be treated.
How steep can the ground be for drone spraying?
Modern agricultural drones handle steep terrain well. For very severe gradients or highly complex terrain, the operator will assess during site evaluation. Contact DroneBoss to discuss your specific block.
What chemicals can be applied by drone in New Zealand?
Herbicides, fungicides, and other approved agricultural chemicals. Mix rates and application requirements follow standard registered labels. DroneBoss operators hold the relevant CAA and agricultural chemical handling certifications.
How accurate is drone spraying on rough terrain?
GPS-guided application means the drone follows the programmed path regardless of the terrain below. Coverage is consistent and the flight data is logged. On rough terrain where ground equipment can’t maintain consistent travel lines, drone spraying typically delivers more even placement.
Is drone spraying cost-effective for steep or wet ground?
For land where the alternative is helicopter spraying or leaving the area untreated, drone spraying is often cost-effective. Contact DroneBoss for a quote on your block – the answer depends on the area, terrain, and what you’d otherwise spend.