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Effects of shift in growing season due to climate change on rice yield and crop water requirements

  • Pu Reun Yoon
  • Jin-Yong ChoiEmail author
Article

Abstract

According to recent climate projections for South Korea, increases in temperature and precipitation will affect water use and crop production associated with paddy rice cultivation. Impacts are expected on crop growing season, crop varieties, and farming methods, all of which are highly vulnerable to disruption in weather conditions. Previous studies have estimated the effects on agricultural water resources according to climate change scenario, but most do not consider the growing season. In this study, changes in paddy rice yield and agricultural water requirement are estimated based on the impact of shift in growing season using a crop growth model. Future weather trends for four selected study areas in central and southern regions of South Korea were constructed using the Representative Concentration Pathway (RCP) 4.5 and 8.5 scenarios developed by the UN Intergovernmental Panel on Climate Change, and the paddy rice yields were simulated using the Crop Environment Resource Synthesis–Rice growth simulation model. Weather, soil, crop data, cultivars, and experimental data were used as model inputs. The results show a delay in the optimal transplanting date in 2100, with the date in the RCP 8.5 scenario delayed rapidly compared with the delay in RCP 4.5. In addition, paddy rice yield and growing period decrease. Consumptive water use and irrigation requirements decrease in the RCP 4.5 scenario due to increased rainfall. However, in RCP 8.5, less precipitation falls during the growing period, leading to an increase in irrigation requirements in some regions. These results are expected to be useful for paddy water management and growing season adjustment and to help establish long-term food security policies.

Keywords

Climate change Growing season adjustment Paddy rice yield Agricultural water use 

Notes

Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Science and ICT) (No. 2017R1E1A1A01077413).

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Copyright information

© The International Society of Paddy and Water Environment Engineering 2019

Authors and Affiliations

  1. 1.Department of Rural Systems EngineeringSeoul National UniversitySeoulRepublic of Korea
  2. 2.Department of Rural Systems Engineering, Research Institute of Agriculture and Life Sciences, Institutes of GBSTSeoul National UniversitySeoulRepublic of Korea

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