Simulated impacts of rise in temperature on kharif sorghum genotypes in Northern Transitional Zone of Karnataka, India

Sannagoudar, Manjanagouda S. and Patil, R. H. and Kumar, R. V. and Singh, A. K. and Ghosh, A. and Halli, H. M. (2020) Simulated impacts of rise in temperature on kharif sorghum genotypes in Northern Transitional Zone of Karnataka, India. CEREAL RESEARCH COMMUNICATIONS, 48 (1). pp. 113-120. ISSN 0133-3720 (print), 1788-9170 (online)

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Abstract

Thoroughly calibrated and validated DSSAT–CERES sorghum model’s seasonal analysis tool was used to evaluate the sensitivity of four kharif sorghum cultivars across three dates of sowing to changes in temperature. Five temperature scenarios (no change in temp, +0.5 °C, +1 °C, +1.5 °C and +2 °C) were created using 32 years’ observed past weather data (1985–2016). The model was run for all four cultivars across three dates of sowing under standard package of practices recommended to Northern Transition Zone of Karnataka for 32 years under rainfed conditions. Average of 32 years’ model simulated outputs revealed that kharif sorghum yield is sensitive to changes in temperature. Among the genotypes tested, CSH-16 gave the highest grain yield in all temperature scenarios across dates of sowing, and was followed by CSV-17, CSV-23 and CSH-23. Among the dates of sowing, across all temperature scenarios, early sowing (15th June) gave the highest grain yield as compared to later sowings (i.e., 30th June and 15th July of 2011 and 2012). Among the cultivars tested, irrespective of dates of sowing, for every 0.5 °C increase in temperature, the average yield reduction was found to be the highest in CSV-23 (9.39%), followed by CSV-16 (7.51%), CSH-23 (7.26%) and CSV-17 (7.25%), which shows the diferential response among cultivars to rise in temperature. This study indicates that as part of adaptation to future climates manipulation in sowing date as well as choice of heat tolerant cultivars would be required.

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