A self-propelled agricultural chemical sprayer is a specialized farm machine designed for efficiently applying pesticides, herbicides, and liquid fertilisers to crops. These machines are self-powered, meaning they have their own engine and propulsion system, unlike tractor-mounted sprayers that rely on a separate tractor for movement. They are known for their high capacity, wide working widths, and ability to navigate fields with minimal crop disturbance, making them suitable for large-scale agricultural operations.