Precision Agriculture represents a new paradigm in modern agriculture. To objective such as increasing productivity and economic efficiency, are joined other arising objective as the environmental concern. Precision agriculture techniques require a better understanding of crop and soil needs, and the use of precise machinery that take into account the spatial-temporal variability across fields. In these terms, the goal of this study was the design, development and evaluation of a universal platform to control a conventional disc fertilizer spreader, and thus able to manage the amount of fertilizer on the go. A specific on-field calibration was necessary to determine the spreader settings for a given type of fertilizer. The components of the hardware modules (control system of disks, interaction with sections control system, etc.) capable of automating actions performed in operation of the spreader were developed. The control system was developed based on an open-source and low-cost microcontroller-board (Arduino), which could be adapted easily to other spreader model, and a firmware capable to control the hardware components. Once installed on-board, field tests were provided to investigate the proper functioning and response time (approx. 1 sec) of the control system and achieve automate the process of varying the fertilizer dose on the go. As noted these preliminary results, the utilization of this prototype as an essential part of a variable input application may found an economic reduction in fertilizer operation and environmental impact, and allows the control of nitrogen or other fertilizer in fields, techniques that definitely significant in modern agriculture production systems.