Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
the major consumers of nitrogen fertilizer and need optimization in terms of input use efficiency.
Grain quality should also be emphasized for achieving nutritional security.
Methodology
Field experiments on maize and rice are being implemented during rabi2020-21andkharif 2021,
respectively, at the experimental farm of ICAR Research Complex for Eastern Region, Patna to
evaluate the effect of different doses of nitrogen (N) on yield parameter of rice, and N content of leaf
at different growth stages of rice and maize. The treatments were 0 to 240 kg N ha -1 at 40 kg intervals
(N0 to N240). Varieties used were TM 214, S2 946, S2 981, 2ATM211 and 2ATM214 for maize,
and Swarna Shreya, Swarna Samridhidhan, Swarna Shakti, Swarna SukhaDhan and RCPR 58 for
rice. N was applied at three equal splits. Each 1/3 rd of N was applied at seeding, knee height and
tasseling stages for maize and at transplantation, maximum tillering and panicle initiation stages for
rice.
Results
The impact of different nitrogen doses on grain yield of maize and rice was clearly discernible (Fig).
The grain yield of maize increased with an increase in N-dose up to 200 kg N ha -1 and beyond that,
no significant gain in yield was noted with additional N-application. The lowest yield of 3.87 t ha -
1 was noted in N0 while the highest yield of 8.06 t ha -1 was noted in 240 kg N ha -1 and it was at par
with 200 kg N ha -1 . Among the different genotypes, S2 946 and S2 981 recorded maximum (6.63 t
ha -1 ) and minimum (5.01 t ha -1 ), respectively.In contrast to maize, rice grain yield increased up to an
N dose of 80 kg ha-1; beyond that, yield was similar. The lowest and highest yield of rice was
registered in 0 kg N ha -1 (3.34 t ha -1 ) and 160 kg N ha -1 (4.94 t ha -1 ).However, the effect of genotype
was absent on rice yield and all genotypes noted similar yield (4.25-4.57 t ha -1 ).
Yield of maize and rice as affected by different doses of N.Mean values followed by different small letters
within N-dose or genotypes are significantly different at P < 0.05 by DMRT.
Sustainable soil management for resilient rainfed agro-ecosystem: conservation agriculture, organic farming,
INM, soil-microorganisms-plant interactions
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