Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
(4.39 t ha -1 ) however, inclusion of ECO2 with ET showed only 26.6% reduction in the grain
yield over ACO2+AT. On the other hand, 18% reduction in biomass yield was observed
under ET alone. With the addition of ECO 2 with ET, 22% increase in biomass yield was
recorded over ET alone i.e. about 4% higher over ACO2+AT. The harvest index (HI) ranged
from 35.8 to 52.9%. Both ET alone and ECO 2+ET showed 20 and 32%, respectively
reduction in HI over ACO 2+AT treatment. With respect to nutrient management practices, i.e.
adaptation strategies, INM (T4) recorded the maximum grain yield (4.58 t ha -1 ), biomass yield
(9.55 t ha -1 ) while 100% organic fertilizers (T 2) recorded the highest HI (52.9%) regardless of
the ECO 2 and ET treatments. On an average, the adaptation strategy, INM, increased the
biomass yield by about 17%, 4.5% and 10% compared to absolute control (T1), 100% organic
(T 2) and 100% inorganic fertilizers (T 3), respectively. On the other hand, 100% inorganic
fertilizers (T3) showed 4.5%, 7.5% and 23% increase in grain yield over T4, T2 and T1,
respectively. Adaption INM and 100% organic nutrient management practices recovered the
grain yield from 8 to 12% and biomass yield from 16 to 19% higher over the yield loss
caused by elevated temperature.
Effect of elevated CO2 and temperature on maize biomass yield (a) and grain yield (b) in acid soils of
Meghalaya
Conclusion
The study showed that maize responded positively to elevated CO2 with respect to plant
growth parameters. On the other hand, elevated temperature decreased the biomass and grain
yield components of maize. ET alone decreased the HI significantly however; addition of
CO2 with ET further decreased the HI significantly. The integrated nutrient management and
FYM application could be better adaptation strategies for significant recovery of the yield
loss caused by the elevated temperature. Further, these adaptation strategies could also
improve the soil fertility under the changing climatic scenario.
Climate resilient agriculture for risk mitigation
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