Effect of Different Modes and Forms of Nitrogen Application on Productivity and Nitrogen Use Efficiency of Rice in the North-Eastern Coastal Plain Zone of Orissa

A field experiment was conducted during 2005 and 2006 in the Research Farm of the Regional Research Station, Motto of North Eastern Coastal plain zone of Orissa to study the performance of different forms of urea viz., Prilled Urea (PU), Nimin Coated Prilled Urea (NCPU), Urea Super Granule (USG) and combination of both USG and PU on yield and nitrogen use efficiency of rice. Results revealed that application of 57 kg N ha^-1 as USG at 7 Days after transplanting (DAT) and 19 kg N ha^-1 as PU at PI stage resulted in maximum grain and straw yields, maximum N uptake and agronomic N use efficiency. Application of USG 57 and 76 kg N ha^-1 registered significantly higher grain yield over PU by 26% and 18%, respectively. Application of NCPU and USG improved the N uptake, agronomic N use efficiency and apparent N recovery over PU application.