Evaluating the Effects of Fertilizer Deep Placement on Greenhouse Gas Emissions and Nutrient Use Efficiency in Wet Direct-Seeded Rice During the Wet Season in Assam, India

Jami Naveen (), Khagen Kurmi, Mrinal Saikia, Kalyan Pathak, Virendar Kumar, Rupam Borgohain, Ashish K. Srivastava, Suryakanta Khandai (), Panneerselvam Peramaiyan, Vivek Kumar, Mintu Sarmah, Bhabesh Gogoi, Kanwar Singh, Sudhanshu Singh, Sumanta Kundu, Kandapu Sai Teja and Guntamukkala Sekhar
Additional contact information
Jami Naveen: International Rice Research Institute, Guwahati 781022, India
Khagen Kurmi: College of Agriculture, Assam Agricultural University, Jorhat 785013, India
Mrinal Saikia: College of Agriculture, Assam Agricultural University, Jorhat 785013, India
Kalyan Pathak: College of Agriculture, Assam Agricultural University, Jorhat 785013, India
Virendar Kumar: International Rice Research Institute, Guwahati 781022, India
Rupam Borgohain: College of Agriculture, Assam Agricultural University, Jorhat 785013, India
Ashish K. Srivastava: IRRI-South Asia Regional Centre, Varanasi 221006, India
Suryakanta Khandai: International Rice Research Institute, Guwahati 781022, India
Panneerselvam Peramaiyan: IRRI-South Asia Regional Centre, Varanasi 221006, India
Vivek Kumar: International Rice Research Institute, Guwahati 781022, India
Mintu Sarmah: College of Agriculture, Assam Agricultural University, Jorhat 785013, India
Bhabesh Gogoi: College of Agriculture, Assam Agricultural University, Jorhat 785013, India
Kanwar Singh: International Rice Research Institute, Guwahati 781022, India
Sudhanshu Singh: IRRI-South Asia Regional Centre, Varanasi 221006, India
Sumanta Kundu: ICAR-Central Research Institute for Dryland Agriculture, Hyderabad 500059, India
Kandapu Sai Teja: College of Agriculture, Assam Agricultural University, Jorhat 785013, India
Guntamukkala Sekhar: College of Agriculture, Assam Agricultural University, Jorhat 785013, India

Agriculture, 2024, vol. 14, issue 11, 1-16

Abstract: Mitigation of greenhouse gases (GHGs), improving nutrient-use efficiency (NUE), and maximizing yield in rainfed lowland rice cultivation poses significant challenges. To address this, a two-year field experiment (2020 and 2021) was conducted in Assam, India, to examine the impact of different fertilizer-management practices on grain yield, NUE, and GHGs in wet direct-seeded rice (Wet-DSR) during the kharif season. The experiment included eight treatments: control; farmer’s practice (30-18.4-36 kg N-P 2 O 5 -K 2 O ha −1 ); state recommended dose of fertilizer (RDF) @ 60-20-40 kg N-P 2 O 5 -K 2 O ha −1 with N applied in three splits @ 30-15-15 kg ha −1 as basal, at active tillering (AT), and panicle initiation (PI); best fertilizer management practices (BMPs): 60-20-40 kg N-P 2 O 5 -K 2 O ha −1 with N applied in three equal splits as basal, at AT, and PI; and fertilizer deep placement (FDP) of 120%, 100%, 80%, and 60% N combined with 100% PK of RDF. The experiment was arranged out in a randomized complete block design with three replications for each treatment. The highest grain yield (4933 kg ha −1 ) and straw yield (6520 kg ha −1 ) were achieved with the deep placement of 120% N + 100% PK of RDF. FDP with 80% N + 100% PK reduced 38% N 2 O emissions compared to AAU’s RDF and BMPs, where fertilizer was broadcasted. This is mainly due to the lower dose of nitrogen fertilizer and the application of fertilizer in a reduced zone of soil. When considering both productivity and environmental impact, applying 80% N with 100% PK through FDP was identified as the most effective practice.

Keywords: Sali rice; fertilizer deep placement; yield; agronomic-use efficiency; N 2 O emissions (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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