Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
with low initial SOC in the rice-wheat cropping system. Cereal-based cropping system, an
integral part of the agricultural food system of India depends on site-specific integrated
nutrient management (INM) practices. Resilience is closely linked to low yield variability
due to climate aberrations, higher soil carbon buildup, higher yield and sustainability. The
predominant cereal-based cropping systems in South Asia are rice-rice, rice-wheat,
pearlmillet-wheat, sorghum-wheat, rice-maize, maize-wheat and rice-mustard. In this study,
we analyzed the response of long-term application of INM on yield sustainability of
important cropping systems through the quantification of climate change parameters and
changes in SOC with respect to cropping systems and climate variability and change.
Finally, we developed a composite resilient index (CRI) as a function of yield sustainability,
climate variability, SOC changes and opportunity for yield enhancement.
Methodology
Long-term experimental data from 28 sites representing different agro-ecological zones of
India, recorded under AICRP-IFS data under different integrated management treatments
were used to investigate for predominant cereal-based cropping systems viz., rice-rice, ricewheat,
pearlmillet-wheat, sorghum-wheat, rice-maize, maize-wheat and rice-mustard during
the period 1980-2015. In this study, all four factors, yield advantages, sustainability, climate
variability, and soil fertility considered to develop the integrated index. Equal weightage was
given to sustainability, climate, organic carbon, yield and based on the order of value of CRI,
primary, secondary, and tertiary site-specific resilient integrated nutrient management
practices were identified for all the sites with respect to different cereal based cropping
systems.
Results
All the indices, viz., Sustainability yield index, coefficient of variation index, soil organic
carbon index, and yield gap index were worked out separately for all the treatments, and the
best treatments were identified based on the highest value of index in each category. As per
the formula, with equal weightage of 0.25 assigned to each index and estimating the
composite resilient index (CRI) based on the highest value, the respective management
practices identified. This will be a "mid-way" path of management practices, which is smart
and resilient with respect to sustainability, higher yield, less climate variability, and good for
soil carbon. Three options for different stakeholders, based on the highest three composite
resilient indices; primary, secondary, and tertiary management options, will provide different
stakeholders with options based on local availability of resources. 50% substitution of
nitrogen through green manure along with remaining recommended dose of fertilizer is the
best management option to address sustainability-yield gap- low climatic variability and for
high soil organic carbon buildup under rice-rice system in Rajendranagar. Similarly,
identified site specific management option for other cropping systems also. The assessment
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Climate resilient agriculture for risk mitigation