Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
with tillage practices under main plot treatments which include T1: Conventional tillage (CT);
T2: Zero tillage (ZT) and T3: Zero tillage + Residue (ZT+R) and nutrient management practices
as subplot treatments which include N1: Recommended Dose of Fertilizer (RDF) @ 120-60-40
kg N-P2O5-K2O kg ha -1 with N applied in three splits; N2: site-specific nutrient management
(SSNM) based on Nutrient Expert for rice @ 109-28-46 kg N-P2O5-K2O with N applied in
three splits and N3: 60 % N @ basal + green seeker ged N application (GSGN) (rest of the N was
applied based on the real-time crop demand at regular intervals) + 100% PK of RDF. Three splits
of N were applied @ 2:1:1 ratio at basal, active tillering, and panicle initiation in N1 and N2
treatments.
Results
The yield attributes like panicles/m 2 and grains/ panicle were significantly higher under ZT+R
(239; 122) over CT (201; 107) among tillage practices whereas, among nutrient management
treatments, SSNM based on Nutrient Expert (228; 119) has significantly higher values over RDF
(212; 111). Both grain and straw yields of DSR were statistically superior in ZT+R over CT with
14.03 % and 9.27 % more yields, respectively but were statistically at par with ZT whereas,
SSNM based on Nutrient Expert has significantly superior grain and straw yields over RDF with
14.91 % and 7.73 % more yields respectively but were statistically at par with 60% N + GSGN +
100% PK of RDF. Any of the treatments did not influence Harvest Index (HI); however, higher
HI was found under ZT+R (41.05) fb ZT (40.89) fb CT (39.86) among tillage practices while,
SSNM based on Nutrient Expert has higher HI (41.25) fb 60% N + GSGN + 100% PK of RDF
(41.04) fb RDF (39.52) across nutrient management practices.These better yields under ZT +R,
ZT could be credited to the improved soil structure, overall porosity, aggregate stability, water
holding capacity (WHC) due to less soil disruption and with constant crop residue accumulation
over the years enriched the soil with organic matter and soil biota which enhances the
mineralization process and increasing plant nutrient availability and also these precision nutrient
management practices aided in timely and balanced availability of all vital nutrients thereby
progressing crop yields through optimized nutrient usage by the rice crop. The total N, P, K, Zn,
Fe, Cu, and Mn uptake by the crop was found to be significantly higher in Zero tillage + Residue
management among tillage practices, whereas among nutrient management treatments, SSNM
based on Nutrient Expert have significantly higher total N, P, and K uptake but has no significant
influence on micronutrient uptake and these results are in accordance with Rajesh et al. (2018).
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