Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
T2: Farmers’ practice (30-18.4-36 kg N-P2O5-K2O kg ha -1 ), T3:Recommended Dose of Fertilizer
(RDF) @ 60-20-40 kg N-P2O5-K2O kg ha -1 with N in three splits @ 30-15-15 kg ha -1 at basal,
active tillering (AT) and panicle initiation (PI), T4: Best management practices (BMP) as per IRRI:
60-20-40 kg N-P2O5-K2O ha -1 with N in three equal splits at basal, AT and PI, T5: Fertilizer Deep
Placement (FDP) with 120% N +100% PK of RDF, T6:FDP with100% NPK of RDF, T7:FDP with
80% N +100% PK of RDF and T8: FDP with 60% N + 100% PK.
Results
Significantly higher number of panicles m -2 (317.52), total grins panicle -1 (217.72), filled grains
panicle -1 (197.97), panicle length (27.90cm) and 1000-grain weight (20.15g) were observed
under FDP with 120 percent N + 100 percent PK of RDF followed by FDP with 100% N +100%
PK of RDF (298.02), (200.47), (178.48), (27.24cm) and (19.86 g) in both years.
Significantlyhighest grain yield (49.33q ha -1 ), straw yield (65.20q ha -1 ) and harvest index (43.06
per cent) were recorded in FDP with 120 percent N + 100 percent PK of RDF. The lowest values
grain yield (19.70 q ha -1 ), straw yield (34.88q ha -1 ) and harvest index (36.03 per cent) were
observed in control.
The highest agronomic nitrogen use efficiency (42.34) was observed in FDP with 80% N +100%
PK of RDF in both the years, whereas maximum recovery efficiency of nitrogen (0. 60),
phosphorus (0.51), and potassium (0.97) was reported in the treatment FDP with 120 % N and
100 % PK of RDF.The data clearly indicate that the deep placement of NPK briquettes enhanced
the recovery of applied N, P and K compared to broadcast application of NPK fertilizers. Highest
N partial factor productivity (0.92) was observed in FDP with 60 % N and 100 % PK of RDF.
Pooled effect of fertilizer management practices on nitrogen agronomic efficiency, partial
factor productivity of nitrogen and recovery efficiency of nitrogen, phosphorus, potassium
in direct seeded rice
Treatment
N Agronomic
efficiency
(kg grainincrease/kg
N applied)
Partial factor
productivity
(kg grain/kg N
applied)
Recovery efficiency (kg
taken up /kg applied)
N P K
T 1: Control - - - - -
T 2: Farmers’ practice 22.40 0.88 0.26 0.09 0.19
T 3: RDF as per AAU 30.17 0.63 0.42 0.24 0.45
T 4: BMP as per IRRI: 30.82 0.64 0.43 0.24 0.46
T 5:FDP with 120% N 41.15 0.69 0.60 0.51 0.97
Sustainable soil management for resilient rainfed agro-ecosystem: conservation agriculture, organic farming,
INM, soil-microorganisms-plant interactions
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