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Proper placement and accurate metering of fertilizer material are primary goals of variable rate application technology. In order to achieve precise dry granular fertilizer placement, a study was undertaken to determine the dynamic behavior of the hydraulic components that control the dispersing and distribution of the fertilizer particles. A study on the dynamic behavior of the solenoid valve and the motor-gearbox combination of the hydraulic system of a commercial spreader for citrus application was performed. The solenoid valve was modeled as a pure delay. The motor-gearbox combinations response was fast as compared to the valves and the needs of the system. Results will help in further improving the design of the hydraulic circuit.