A field experiment was undertaken at Woito, to determine the effect of seed rate on productivity of rice (Oryza Sativa L.), at Woito. The experiment was conducted with five levels of seed rate (40, 60, 80, 100 and 120 kg ha-1). The treatments were laid out in a randomized complete block design (RCBD) with four replications. Phenological and growth parameters such as yield and yield components, total biomass and harvest index were studied. The result showed that all the phenological and growth parameters except panicle length per plant were significantly affected by the treatments.