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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 722 | Page
International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad Conclusion CERES-Sorghum model of DSSAT was calibrated and validated for a semi-arid location in India for climate change impact assessment in sorghum. Rising temperatures (both Tmax and Tmin) caused a shortening of crop duration (in future climates). Shortening of crop duration led to a reduction in yield as it affected both vegetative growth and reproductive phases. This may be the reason for the decrease in yield consistently during future climates, except during the near century, where a marked increase in both Tmax and Tmin was not projected. The results of the study highlight the necessity to develop adaptation strategies for overcoming the negative impact of projected climate on sorghum cultivation. References Guo Y, Wu W, Du, M., Liu, X., Wang, J., Bryant, C.R. 2019 Modelling climate change impacts on rice growth and yield under global warming of 1.5 and 2.0 °C in the Pearl River Delta, China. Atmosphere. 10:567. Chandran M. A. S, Banerjee S, Mukherjee A, Nanda M.K. and Kumari V.V. 2022. Evaluating the long-term impact of projected climate on rice-lentil-groundnut cropping system in lower gangetic plain of India using crop simulation modelling. Int J Biomet. 66: 55-69. T5-10P-1003 Stress Management in Wheat Crop through Foliar Spray of TGA Agrochemical R. S. Rathore 1 , Dayanand 1 , P. P. Rohilla 2* , S. K.Singh 2 and V. Nagar 2 1 Krishi Vigyan Kendra, Abusar-Jhunjhunu (Raj.), 2 Swami Keshwanand Rajasthan Agricultural University, Bikaner (Raj.)-333001 (India). *drpprohilla@gmail.com Wheat (Triticum aestivum L.) is the second most important cereal crop after rice in providing food and nutritional security to the masses in India. It is the most widely cultivated cereal crop which is the largest contributor with nearly 30% of the world grain production and 50% of the world grain trade. FAO estimated that the world would require additional 198 million tonnes of wheat by 2050 to accomplish the future demands, for which wheat production need to be increased by 77% in the developing countries. Regarding the global climate change in the past few decades, the impact of rising temperature on wheat production is gaining concern worldwide. Heat and drought are the major abiotic stress limiting the wheat production, which are common in semi-arid and arid region. Keeping the above problem in view total 80 demonstrations on wheat crop were conducted at farmer’s field in NICRA village Bharu, Jhunjhunu (Rajasthan) during rabi season 2017-18 to 2020- 21 for four consecutive years to assess the effect of TGA (Thio Glycolic Acid) agrochemical foliar spray on stress management in wheat crop. TGA is the organic compound, often called Mercapto 723 | Page Emerging approaches (RS, AI, ML, Drones etc) for crop management &assessment
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Extended Summaries 22-24 December,
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Resilience through land and water m
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International Conference on Reimagi
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Theme- 2 Ecosystem based approaches
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Resource conservation and rainfed a
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Theme- 6 Institutional and policy i
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