Nitrogen management in transplanted rice (Oryza sativa) in mid hill acidic soils of Sikkim Himalayas
Year: 2001
Type: article
Abstract: Two field experiments were conducted at Tadong in Sikkim in the humid mid-hill acidic soils during rainy ( kharif) season of 2004, 2005 and 2006 to optimize the rate, source and schedule of nitrogen management for increasing the yield and nitrogen-use efficiency of transplanted rice ( Or yza sativa L.) under 9 schedules, 4 rates (0, 80, 120 and 160), 3 nitrogen sources (urea, farm yard manure and neem cake-coated urea) in comparison with farmers practices. N application @ 80 kg/ha as N 10 days after transplanting (DAT) + N at maximum tillering (MT) + at panicale initiation (PI) recorded the highest yield (5.44 t/ha), recovery efficiency (82%) and agronomic efficiency (47.9 kg grain / kg N applied). The grain yield increased with increase in the N rate from 80 to 160 kg/ha. Conjunc- tive application of FYM and urea increased the N uptake by 11.1 to 26.2%, recovery efficiency (11.1 to 46.7%) and agronomic efficiency (5.4 to 14.8 %). Basal application of FYM @ 2.5 t/ha and top-dressing 80 kg N/ha through urea as N at 10 DAT + N at MT+ at PI stage recorded the highest recovery efficiency (66.3%) and agro- nomic efficiency (38.7 kg grain / kg N applied). At 120 kg N/ha neem cake increased the recovery efficiency by 12.1 and 37.6% and agronomic efficiency by 9.9 and 15.8% over N with and without FYM. Farmers practice of 120 application of FYM basal @ 5 t/ha and FYM @ 2.5 t/ha along with top-dressing of DAP @ 40 kg/ha at PI gave low yield and N-use efficiency.
Source: Indian Journal of Agronomy
Author: RAVIKANT AVASTHE
Institution: ICAR Research Complex for NEH Region
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W1598986280