Abstract: Field experiment has been conducted at wetlands (Vertic ustochrept), Agricultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore during Kharif (June to October) season of 2005, to ascertain the optimum irrigation method and nitrogen dose to enhance aerobic rice (Oryza sativa L.) productivity with PMK 3 cultivar. Four irrigation regimes viz., irrigation at IW/CPE ratio of 0.8, 1.0, 1.2 and micro sprinkler irrigation once in three days, four N levels viz., 100, 125, 150 and 175 kg ha-1 were tested in strip-plot design with three replications. Irrigation regimes and N levels increased the Leaf Area Index (LAI) and soluble protein content in a dose response manner. Irrigation treatments did not affect the chlorophyll content. However, N levels increased the chlorophyll content. Irrigation at 1.2 IW/CPE ratio recorded significantly minor proline accumulation, crop growth rate and yield with less moisture stress. N levels (150 and 175 kg N ha-1) produced on par growth and yield. Hence, irrigation at 1.2 IW/CPE ratio with 150 kg N ha-1 will be optimum to realise the maximum productivity under aerobic rice cultivation.