Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
T4-12P-1035
Impact of Fertilizer Deep Placement on Yield and Nutrient Use Efficiency of
Direct Seeded Rice
Jami Naveen 1* , K. Kurmi 2 , K. Pathak 2 , M. Saikia 2 , V. Kumar 3 , A. K. Srivastava 3 , S. Kundu 1 ,
M. Sharmah 2 , K. Sai Teja 2 , A. Hazarika 2 and K. Sammi reddy 1
1 ICAR- Central Research Institute for Dryland Agriculture, Santhoshnagar, Hyderabad, Telangana, India
2 Assam Agricultural university, Jorhat, Assam, India
3
International Rice Research Institute, Varanasi, Uttar Pradesh, India
*jaminaveen17@gmail.com
Rice production needs to be increased by 1.2 to 1.5 per cent annually in order to meet the world's
food needs (Dansoet al., 2021). To produce 1 kg of rice grain, 15–20 g of nitrogen (N) needs to be
added. In Assam, rice is major staple food crop. It accounts for 2.54 million ha of the gross
cropped area of 4.16 million ha and accounts for 96 per cent of the state's total food grain
production (Anon 2021). In Assam, rice is grown in three distinct seasons: kharif or sali, boro, and
ahu, in a variety of ecosystems including deep water, rain-fed, and irrigated conditions. Among
these seasons, alirice is the most common because it receives the maximum amount of rainfall.
Nitrogen availability is the major limiting factor in this season. A lerger part of the applied N
fertilizer is losttrhoughvolatilization, denitrification, run-off, leaching, and fixation (Gaihreet al.,
2018). As a result, nitrogen use efficiencyis very low (30-35 percent) in rice cultivation. Fertilizer
deep placement (FDP) of urea or multi-nutrient briquettes (N, P and K) is one of the best N
management practices in lowland rice fields for achieving these multiple benefits. Deep placement
of urea of larger size particle not only improves its use efficiency but also provides environmental
benefits by reducing runoff and nitrogen volatilization losses. In the above backdrop, this study
was conducted to find out the effect of fertilizer deep placement on N-use efficiency and
performance of direct seeded rice.
Methodology
A field experiment was initiated in 2020 in the Instructional-Cum-Research (ICR) farm, Assam
Agricultural University, in low land condition. The soil was sandy loam, acidic in reaction,
medium in organic carbon and available N, low in available P2O5 and medium in available K2O. A
long duration rice variety Ranjit-Sub1 was taken as test variety. The total amount of rainfall
received during the crop growth period of first year was 1098.80 mm with a corresponding value
of 650.80 mm in the second (2021) year. The experiment was laid out in a randomized block
design, replicating three times with eight treatment combinations, viz., T1: Control (No Nitrogen),
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