Field experiments were conducted at Agricultural Research Station, Mannuthy during 2004- 2006, to study the residual effects of stages and methods of incorporation of concurrent growing of daincha and nitrogen levels applied in the previous wet seeded rice to the succeeding transplanted crop and to study extent of nutrient saving by concurrent growing of daincha to the residual crop. Stage of incorporation of concurrently grown daincha in wet seeded rice had significant influence on the productivity, profitability of succeeding rice crop. Incorporation of daincha at 30 DAS ensured increased yield and sustainability of the rice- rice system. Methods of incorporation of concurrently grown daincha in wet seeded rice and nutrients applied to the wet seeded crop had no significant influence on the yield of succeeding rice crop. To realize the maximum yield (3.88 /ha) from succeeding transplanted rice, 100 per cent of the recommended N should be supplied to the succeeding rice in the rice-rice system.