Studies on nitrogen and potassium management in maximizing hybrid rice productivity

Field experiments were conducted at Agricultural College and Research Institute, Madurai during kharif and rabi seasons of 2000 – 2001 and 2001–2002, 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 200kg ha⁻¹ inorganic nitrogen improved the yield and yield attributes of rice hybrids (ADTRH 1 and CORH2) and also recorded higher yield (8210 kg ha⁻¹ in kharif and 7775 kg ha⁻¹ in rabi seasons) Similarly, application of N and K in four equal splits at active tillering, panicle initiation, booting and flowering recorded higher yield (7598 kg ha⁻¹ in kharif and 7272 kg ha⁻¹ in rabi seasons).