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This paper summarizes the development of a mechanistic ground sprayer model, built upon the same analytical Lagrangian approach used in the aerial spray model AGDISP. For the ground sprayer model the wake and turbulence of the aircraft are removed and more detailed modeling of the nozzle jets (and jet entrainment) are included. The ground model predicts the spray deposition downwind from the application area for any set of initial conditions, and recovers results consistent with Spray Drift Task Force field data.