Speed, Volume and Swath Width — Can Drones Hit the Target on the Farm?

Why It Matters

Accurate drone‑spraying parameters will give growers reliable, cost‑effective crop protection and speed regulatory approval of drone‑applied chemicals in Canada.

Key Takeaways

• Agras T100 can fly up to 76 km/h, far faster than earlier models
• Increasing water volume from 5 to 10 gal/acre improves spray coverage
• Slower flight speeds enhance droplet penetration into wheat canopies
• Wind shifts markedly alter droplet landing, challenging consistent application
• Upcoming corn trials will compare ROI of fast‑capacity vs. targeted spraying

Pulse Analysis

Regulators in Canada are actively revising pesticide legislation to accommodate unmanned aerial systems, but growers lack a solid data foundation for making drone‑spraying decisions. The Ontario Ministry of Agriculture’s partnership with Bayer Crop Science reflects a broader industry push to translate laboratory research into field‑ready guidance. By focusing on the DJI Agras T100—a platform capable of speeds near 76 km/h and larger payloads than its predecessors—researchers aim to define the operational envelope that balances efficiency with precision, a prerequisite for broader market acceptance.

Initial findings from the Sparta, Ontario winter‑wheat trial highlight the delicate trade‑offs inherent in drone application. Doubling water volume from five to ten gallons per acre markedly improves droplet coverage, while slower flight speeds allow the downwash to drive chemicals deeper into the canopy. Conversely, higher speeds expand the swath, reducing flight time but introducing greater variability in deposition, especially under shifting wind conditions. These insights underscore that wind remains the most unpredictable factor, capable of diverting droplets and compromising uniformity even with modest speed changes.

The next phase will shift from agronomic performance to economics, testing corn crops to compare return‑on‑investment between rapid, high‑capacity spraying and slower, more targeted approaches. Quantifying cost savings, yield protection, and input efficiency will equip growers with a business case for adopting drone technology at scale. As research matures, the industry anticipates a clearer pathway to regulatory approval, enabling Canadian farms to leverage drones for faster, more precise crop protection while maintaining profitability.

Original Description

As Canadian regulators move closer to expanding drone application opportunities in agriculture, researchers are racing to answer a critical question: how can growers ensure fungicides and herbicides applied by drone deliver consistent, effective crop protection?

That question will keep Ontario Ministry of Agriculture, Food and Agribusiness application technology specialist Jason Deveau busy this season as he runs a series of drone research trials aimed at finding answers. This week, Deveau was working with Bayer Crop Science at a winter wheat drone application trial near Sparta, Ont., using the DJI Agras T100 drone.

The challenge, he explains, is that drone application differs significantly from traditional field sprayers. Factors such as flight speed, altitude, droplet size, water volume, swath width, and wind conditions can dramatically influence spray coverage and drift potential.

“The number one thing that we need to know is how wide can we reasonably spray,” Deveau says. Unlike a field sprayer with a fixed boom width, drone swath widths can change depending on operating conditions. “We want a number that’s consistent and trustworthy, so that we know what flight spacing to use and still get good coverage.”

Wind is proving to be one of the biggest variables. During the Sparta trials, even relatively minor changes in wind speed and direction affected where spray droplets landed. “If we can’t capture it under controlled situations, once you’re out in the field and hoping you’re getting solid and predictable coverage, what’s it going to do then? We don’t know.”

The research team is evaluating how operator-controlled settings influence coverage in wheat fungicide applications. Using water-sensitive paper positioned throughout the crop canopy, researchers are measuring how effectively spray reaches the target at different speeds and water volumes.

For Deveau, the arrival of the DJI Agras T100 means much of the industry’s existing knowledge needs to be revisited. The drone is capable of speeds approaching 76 km/h and features significantly greater capacity than previous models.

Early observations from the trials suggest that increasing water volume from five to 10 gallons per acre improves the chances of achieving adequate coverage. Slower speeds also appear to help the drone’s downwash push droplets deeper into the canopy. Faster speeds can widen the swath and improve efficiency, but they may also create more variability in spray deposition.

The research will eventually move beyond coverage assessments to focus on economics. Deveau says future trials in corn will examine return on investment, comparing faster, higher-capacity application strategies with slower, more targeted approaches to determine whether efficiency gains come at the expense of yield protection.

The goal is to build the research foundation growers will need when drone-applied crop protection products receive broader approval for use in Canada, says Deveau. He'll be sharing his trial results and recommendations online at Sprayers101.

Website: https://www.realagriculture.com/

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