Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
farm pond was worked out. Since the crops are grown in rainfed regions, there was no irrigation
to the crop other than rainwater, the total rainwater utilized by the crop throughout the crop
season to calculate rainwater use efficiency (RWUE). In case supplemental irrigation, the depth
of supplemental irrigation would be added to the cumulative depth of rainfall.
Results
Annual rainfall and NEM rainfall, runoff causing rainfall, actual runoff generated, runoff water
harvested in the pond during 2011 to 2021 is presented here.
Year
Runoff water generated and rainwater harvested in the farm pond
Rainfall,
mm (rainy
days)
Annual
rainfall
Excess /
Deficit
Rainfall,
mm (rainy
days)
NEM
rainfall
Excess /
Deficit
Runoff
causing
rainfall,
mm
Runoff,
mm
Water
harvested
in pond, m 3
2011 787.6 (42) 7% Excess 503.4 (22) 26% Excess 244.6 46.5 480
2012 392.9 (23) 46% Deficit 228.3 (14) 42.4% Deficit 81.8 32.6 326
2013 421.3 (28) 42% Deficit 252.8 (17) 35.4 % Deficit 105.8 41.0 409.8
2014 666.8 (48) 7.7% Deficit 301.2 (21) 23 % Deficit 63.6 20.3 215
2015 988.6 (52) 35.3 % Excess 475.8 (21) 21 % Excess 59.4 18.8 188
2016 199.6 (15) 72 % Deficit 80.2 (7) 79.8 % Deficit 0 0 No runoff
2017 801.7 (36) 12.3 % Excess 421.4 (17) 6.2 % Excess 282.4 26.8 268
2018 410.6 (34) 42.5 % Deficit 213.9 (19) 46 % Deficit 0 0 No runoff
2019 668.1 (46) 5.2 % Deficit 426.4 (28) 9.2 % Excess 108.9 25.8 258
2020 905.6 (47) 29.5 % Excess 473.3 (26) 21.2 % Excess 125.6 27.4 274
2021 914.7 (60) 28.65% Excess 532.3 (29) 33.9 % Excess 151.9 48.0 481
Mean 650.68 (39) 355.36 (20) 111.27 26.11 263.62
Out of 11 years, 5 years experienced excess annual and seasonal rainfall ranging from 7 to 35
per cent over normal rainfall. Total water harvested in the farm pond over the study period was
263.6 cubic m. Pond reaches its full capacity of 480 m 3 when NEM rainfall is 450 mm. SI was
given when runoff water drained into pond was greater than 250 m 3 . Runoff coefficient
obtained from rainfall-runoff was found to be 0.24.
Ridges and furrows were found to be the most promising in-situ moisture conservation
practices in the catchment area for cotton production. Rainwater harvested from this area was
stored in the farm pond and was used for supplemental irrigation to 0.4 hectares when the dry
spell exceeded 15 days during active crop growth stages. The response of SI on yield and
RWUE in rainfed cotton production is presented as follows.
Resilience through land and water management interventions, water management and governance
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