Spraying 200 acres with a drone sounds straightforward
Plan the mission, fill the tank, and fly.
That’s what it sounds like on paper.
But when you get to the ground, things are different.
In one of our most challenging projects, we were to spray herbicide on 200 acres using a DJI Agras T50 before the planting season. It took us two days, and it wasn’t as smooth as we thought it would be. It was a good reminder that drone technology is only as good as its performance in real-world conditions.
Terrain Changes Everything
One of the biggest challenges we faced with this operation was the terrain. In flat ground without any obstructions, spraying is easy, and you will be done in no time. But this was not. It was hilly and had several obstacles along the way, making it difficult to run a continuous mission. The several irregular turns and adjustments minimized the efficiency for which drone spraying is known.
Distance vs Battery Reality
Distance is one aspect most people ignore. One of the biggest challenges with drones is their limited flight time, often as low as 15 minutes. In this particular farm, some distances were as long as 900 meters, which meant the drone often returned with very low battery power. To run smoothly, the drone had to take off with half its capacity, which meant more refills and more battery swaps.
Conditions Matter A lot
Since it was after the rain, the ground was quite muddy. This meant that the farmer couldn’t deploy their tractors there, and those that they sent were stuck. It also meant that we couldn’t just take off and land from anywhere. Wind direction and speed also kept changing throughout the day, which meant we needed to keep adjusting droplet size, flow rates, flying speed, and direction, further slowing operations.
How the Drone Proved Itself
Despite these constraints, the system allowed us to maintain a high level of control throughout the operation.
The drone continuously adjusted its flow rate based on speed, ensuring consistent application even as it slowed around corners or navigated uneven terrain and obstacles. This level of precision is difficult to achieve with traditional methods, where variations in speed often lead to uneven coverage.
Another key advantage was resource efficiency. Using the drone, we applied approximately 40 litres of mixture to cover about 5 acres.
Under traditional methods, the same area would typically require 400 to 500 litres. This reduction in water use simplified logistics, reduced downtime, and allowed for a more streamlined operation overall.
So, What Did We Learn?
The biggest takeaway from this project is simple:
Drone spraying is not just about speed.
Yes, drones can cover large areas. But what determines the outcome isn’t how fast you fly, it’s how well the entire operation is managed.
In practice, success comes down to a few key things.
- Planning - Understanding the field, mapping out the workflow, and anticipating how terrain and distance will affect each flight makes a big difference. What works on flat land doesn’t always translate to hilly ground.
- Terrain awareness - Then there’s terrain awareness. Elevation changes, slope, and field layout directly impact how efficiently each pass is completed. Ignoring this leads to more interruptions and inconsistent coverage.
- Operations management - You also have to manage the operational cycle—battery life, flight distance, and refill timing. Spraying large areas isn’t one continuous run. It’s a series of controlled flights, each one requiring coordination to maintain efficiency.
- Adaptation - And finally, there’s the ability to adapt in real time. Wind, ground conditions, and even subtle environmental changes can affect performance. Adjustments have to be made continuously to maintain spray quality.
At the end of the day, the value of drone spraying isn’t just in covering ground.
It’s in how precisely and consistently that ground is covered.