Field experiments were carried out in Dan Phuong district, Hanoi city in order to investigate the effects of phosphoric fertilizer on the same physio-biochemical parameters and rice yield. Phosphoric fertilizer was applied at 0, 60, 90 and 120 kilograms P2O5 per hectare. Study results showed that phosphoric fertilizer had positive impact on the chlorophyll contents, catalase and peroxydase activities, yield components and grain yield. The best effect was obtained when phosphoric fertilizer was applied at 90 kilograms P2O5 per hectare.