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A comprehensive experimental and analytical study was performed to investigate particle trajectories on and off a spinner spreader. Sixteen different granular fertilisers were used. Measurements of the significant material properties, on-spinner trajectories, and off-spinner distance distributions were made. Analytical models for the on- and off-spinner trajectories were also presented and a comparison between the predictions and experimental results were made. The models reasonably predict, on average, the distance the real fertiliser materials travel.