An experiment was conducted at Fogera Plain during the rainy seasons of 2017 and 2018 toپ determine the effects of seed rate and row spacing on yield and yield component of rain fed lowland riceپ ecosystem. Four row spacing’s (15, 20, 25and 30 cm) and Seven seed rates (40, 60, 80, 100, 120,140 and160 kg/ha) were combined factorially and laid in RCB Design with three replications.The objective of the experiment was to determine the effect of row spacing and seed rate on yield and yield components of rice in Fogera plain. All collected data were subjected to analysis of variance. Economic analysis was also done for grain yield. The results of the experiment showed that the main effect of seed rate was significantly affecting, panicle length, number of total and effective tillers per row meter length, grain yield, straw yield and harvest index whereas row spacing was significantly affected grain yield and number of total and effective tillers per row meter length. The interaction effect of seed rate and row spacing was significantly (p<0.01) affected total tillers, number of effective tillers and grain yield. The highest grain yield (3.25tha-1) was obtained at a seed rate of 120 kgha-1 and 30 cm row spacing. The economic analysis indicated that a seed rate of 100 kg ha-1 and row spacing of 20 cm is the most profitable treatment with mean net benefit of 50982.5.Birrha-1. Therefore it can be concluded that a seed rate of 100 kg/ha and row spacing of 20 cm is preferable and recommended for rain fed lowland rice production ecosystem in Fogera plain.