Aerial Spray Application Technologies in Agriculture

Aerial spray application technologies encompass a suite of mechanised and autonomous platforms designed to deliver crop protection agents and nutrients across diverse farming systems. These technologies range from fixed‐wing aircraft and helicopters to rotary‐wing unmanned aerial vehicles (UAVs) and man-portable systems. By leveraging controlled droplet generation, airflow management and precise navigation, aerial platforms enable rapid coverage of large or difficult‐access areas, minimise operator exposure and reduce labour intensity. Advances in nozzle design, spray atomisation and real-time monitoring have improved droplet size control and deposition uniformity, enhancing efficacy while mitigating off-target drift. Integrating geospatial mapping, variable-rate application and sensor-driven decision support allows for site-specific treatment that responds to pest pressure, plant health and environmental conditions. The global uptake of aerial spraying is driven by the need for high operational efficiency, reduced environmental footprint and compliance with increasingly stringent regulations on pesticide use. Nonetheless, challenges remain in optimising spray patterns under variable meteorological conditions, ensuring human and bystander safety, and quantifying ecological impacts. Ongoing research addresses the aerodynamics of rotor downwash, the interaction of spray droplets with crop canopies, and the development of low-volume formulations that maintain efficacy. Collectively, these efforts seek to balance high-throughput application with precision and sustainability, supporting agricultural modernisation across temperate, tropical and arid regions.

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Aerial Spray Application Technologies in Agriculture publication trend

The graph below shows the total number of articles in aerial spray application technologies in agriculture across all publications each year (not limited to Nature Index journals).

Technical terms

Unmanned aerial spraying system (UASS): A remotely piloted or autonomous aircraft platform equipped with spray booms or nozzles for pesticide or nutrient application.

Spray drift: The transport of spray droplets by air currents away from the intended target, leading to potential off-target deposition.

Volume median diameter (VMD): The droplet size, in micrometres, for which half of the total spray volume is composed of droplets larger and half smaller than that diameter.

Deposition uniformity: A measure of the consistency of spray coverage across the target surface, often expressed as a coefficient of variation.

References

1. Environmental, bystander and resident exposure from orchard applications using an agricultural unmanned aerial spraying system. The Science of The Total Environment (2023).
2. Effect of Droplet Size Parameters on Droplet Deposition and Drift of Aerial Spraying by Using Plant Protection UAV. Agronomy (2020).
3. Comparison of Spray Deposition, Control Efficacy on Wheat Aphids and Working Efficiency in the Wheat Field of the Unmanned Aerial Vehicle with Boom Sprayer and Two Conventional Knapsack Sprayers. Applied Sciences (2019).