Abstract

                                Field experiments were conducted at Agricultural College and Research Institute, Madurai during kharif and rabi seasons of 1999-2000 and 2000-2001, to study the effect nitrogen and potassium management in maximizing the productivity of hybrid rice (ADTRH 1 and CORH 2). The experiments were laid out in randomized block design with three replications. The treatments included sources and levels of nitrogen and split application of N and K. The results revealed that application of 10 t ha-1 green manure along with 200 kg ha-1 inorganic nitrogen improved the yield and yield attributes of rice hybrids (ADTRH 1 and CORH2) and also recorded higher yield (8210; 7775 kg ha-1 in kharif and rabi seasons respectively). Similarly, application of N and K, in four equal splits at active tillering, panicle initiation, booting and flowering recorded higher yield of 7598 kg ha-1 in kharif and 7272 kg ha-1 in rabi seasons.

Key words : Hybrid rice, Green manure, Inorganic nitrogen, Split application, Yield.