Response of hybrid rice (Oryza sativa) to levels and time of application of nitrogen

Abstract

A field experiment was conducted during the rainy (kharif) season of 1998 and 1999 to study the effect of levels (0, 150, 200 and STCR based N ) and time of application (3 or 4 splits) of nitrogen on CoRH 1 t ybiid rice (Oryza sativa L.). Hybrid rice recorded good response to N up to 256.7 kglha (STCR based N). Higher levels of N improved the growth and yield of rice. The STCR based N applied in 4 splits (basal, active tillering, panicle initiation and panicle emergence) registered the maximum grain yield, followed by 200 kg Nlha applied in 4 splits. Based on benefitcost ratio and nitrogen use efficiency application of 200 kg Nlha in 4 splits (basal, active tillering, panicle initiation and panicle emergence) was found to be superior to the other treatments.