Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
Results
Changes in projected climate compared to baseline: The mean seasonal rainfall during the baseline
period was 527 mm. The mean seasonal rainfall is projected to change by -8.7%, -7.6%, -8.3%, +1.7%,
+0.8% and +1.1% during near-century-RCP4.5, near-century-RCP8.5, mid-century-RCP4.5, midcentury-RCP8.5,
end-century-RCP4.5, end-century-RCP8.5, respectively. The mean baseline
maximum temperature (Tmax) during the sorghum growing period was 32 °C. No change in Tmax is
projected during the near century under both RCP4.5 and 8.5. It is projected to increase by 1 °C during
mid-century (RCP4.5 and 8.5) and end-century-RCP4.5; 2 °C by end-century-RCP8.5. Similarly, Tmin
is projected to increase by 1 °C during the near-century (both under RCP4.5 and 8.5), mid-century and
end-century under RCP4.5. During the end-century-RCP8.5, the projected rise in Tmin is +3 °C.
Projected changes in phenology: A delayed anthesis and maturity by 1-2 days is projected for all three
sorghum cultivars (CSV-20, 23 and 27) during near-century-RCP4.5 and 8.5 as depicted in the figures
below. During all other future scenarios, days to anthesis and total crop duration are projected to
decrease. The highest decrease is projected during end-century-RCP8.5 (6-7 days for days to anthesis
and 7-10 days for total crop duration). The major reason for this may be the projected increase in both
Tmax and Tmin, which will cause a faster accumulation of growing degree days (Guo et al., 2019;
Chandran et al., 2022).
Projected changes in grain yield: The yield is projected to decrease during all future scenarios. For
CSV-20, the projected yield reduction is -5%, -6%, -13%, -22%, -11% and -31% during near-century-
RCP4.5, near-century-RCP8.5, mid-century-RCP4.5, mid-century-RCP8.5, end-century-RCP4.5, endcentury-RCP8.5,
respectively (Fig. 1b). For CSV-23, the projected reduction is -1%, -2%, -8%, -8%, -
4% and -15%, respectively during the above-mentioned future climates. For CSV-27, the yield is
projected to decrease by -4%, -4%, -10%, -12%, -5% and -18%. It was observed that among the three
cultivars, the yield of CSV-20 will be reduced to a greater extent than the other two. Among the two
emission scenarios, a greater yield reduction was simulated under RCP8.5, compared to RCP4.5 during
all the future climates
Projected changes in (a) phenology and (b) yield of three sorghum cultivars during future climates under
a semi-arid environment
Emerging approaches (RS, AI, ML, Drones etc) for crop management &assessment
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