Variable Rate Control System Designed for Spinner Disc Fertilizer Spreader – “Pre Fer”

The objectives of this study were: development of fertilizer rate control system which allows applying of granular fertilizer at variable rates, adopting it into a commercial granular fertilizer spreader, and then investigation and evaluation of its performances. A control program in C++ software environment, using the Raisonance 8051 IDE tool was developed. The system was tested in laboratory conditions. Each of rollers released fertilizers almost equally at different application rates. The system can easily be attached to local made spreaders with some mechanical modification. Further tests are needed to verify systems performance in field conditions.