As inherent spatial variability of soil phosphorus (P) within a field is usually considerable, variable rate (VR) technology for P fertilization should be implemented over small area. The objective of this study was to develop and evaluate a soil sensor- based variable rate phosphorus fertilization system for on-the-go phosphorus application. The maize plant density, the number of plant leaves and yield were considered as growth indices, while comparing VR and uniform rate(UR) treatment. A total average phosphate rate of 28.24 kg/ha was applied on VR plots which was 1.76 kg/ha less than the UR,30 kg/ha recommended by the standard soil test. No significant difference was observed in plant density and the number of plant leaves while comparing those treatments. However, the yield for VR treatment was significantly higher than for UR treatment.
