Identifying most promising agronomic adaptation strategies to close rainfed rice yield gap in future: a model-based assessment
There is an increasing consensus that climate change may have a high negative impact on crop yield, and that it will affect farmers in developing and least developed counties the most. ‘Closing the yield gap’ could be one of the promising options to address the issue of yield improvement. Better und...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2021-09-01
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| Series: | Journal of Water and Climate Change |
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| Online Access: | http://jwcc.iwaponline.com/content/12/6/2854 |
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| author | Subhankar Debnath Ashok Mishra D. R. Mailapalli N. S. Raghuwanshi |
| author_facet | Subhankar Debnath Ashok Mishra D. R. Mailapalli N. S. Raghuwanshi |
| author_sort | Subhankar Debnath |
| collection | DOAJ |
| description | There is an increasing consensus that climate change may have a high negative impact on crop yield, and that it will affect farmers in developing and least developed counties the most. ‘Closing the yield gap’ could be one of the promising options to address the issue of yield improvement. Better understanding of adaptation strategies and implications of the adaptations in crop yield are required to close the yield gap. In this study, the effectiveness of agronomic adaptation options on the rainfed rice yield gap was evaluated for the baseline period (1981–2005) and two future periods (2016–2040 and 2026–2050) for India by using bias-corrected RegCM4 output and the Decision Support System for Agrotechnology Transfer (DSSAT) model. Results suggested that a combined adjustment of transplanting time (advancing by fortnight), crop spacing ((10 × 10) cm) and N-fertilizer application (140 kg/ha) was the best strategy as compared to the single adaptation option to close the yield gap under the climate change scenario. The strategy improved rice yield by 37.5–168.0% and reduced the average attainable yield gap among the cultivars from 0.74 to 0.16 t/ha under future climate projection. This study provides agronomic indications to rice growers and lays the basis for an economic analysis to support policy-makers in charge of promoting the sustainability of the rainfed rice-growing systems. HIGHLIGHTS
The study assessed the rice yield gap in India by using the DSSAT model.;
Equidistant quantile mapping technique is used for bias correction of RCM outputs.;
The reduction of yield due to climate change is found to be the lowest for long duration cultivar (∼0.25 t/ha).;
Combination of adaptation options improves rice yield by 37.5–168.0%.;
It reduces the average attainable yield gap from 0.74 to 0.16 t/ha among cultivars in future.; |
| first_indexed | 2024-12-17T13:45:06Z |
| format | Article |
| id | doaj.art-a5984a6cca094840b4ad797291aab965 |
| institution | Directory Open Access Journal |
| issn | 2040-2244 2408-9354 |
| language | English |
| last_indexed | 2024-12-17T13:45:06Z |
| publishDate | 2021-09-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Journal of Water and Climate Change |
| spelling | doaj.art-a5984a6cca094840b4ad797291aab9652022-12-21T21:46:11ZengIWA PublishingJournal of Water and Climate Change2040-22442408-93542021-09-011262854287410.2166/wcc.2021.094094Identifying most promising agronomic adaptation strategies to close rainfed rice yield gap in future: a model-based assessmentSubhankar Debnath0Ashok Mishra1D. R. Mailapalli2N. S. Raghuwanshi3 Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India There is an increasing consensus that climate change may have a high negative impact on crop yield, and that it will affect farmers in developing and least developed counties the most. ‘Closing the yield gap’ could be one of the promising options to address the issue of yield improvement. Better understanding of adaptation strategies and implications of the adaptations in crop yield are required to close the yield gap. In this study, the effectiveness of agronomic adaptation options on the rainfed rice yield gap was evaluated for the baseline period (1981–2005) and two future periods (2016–2040 and 2026–2050) for India by using bias-corrected RegCM4 output and the Decision Support System for Agrotechnology Transfer (DSSAT) model. Results suggested that a combined adjustment of transplanting time (advancing by fortnight), crop spacing ((10 × 10) cm) and N-fertilizer application (140 kg/ha) was the best strategy as compared to the single adaptation option to close the yield gap under the climate change scenario. The strategy improved rice yield by 37.5–168.0% and reduced the average attainable yield gap among the cultivars from 0.74 to 0.16 t/ha under future climate projection. This study provides agronomic indications to rice growers and lays the basis for an economic analysis to support policy-makers in charge of promoting the sustainability of the rainfed rice-growing systems. HIGHLIGHTS The study assessed the rice yield gap in India by using the DSSAT model.; Equidistant quantile mapping technique is used for bias correction of RCM outputs.; The reduction of yield due to climate change is found to be the lowest for long duration cultivar (∼0.25 t/ha).; Combination of adaptation options improves rice yield by 37.5–168.0%.; It reduces the average attainable yield gap from 0.74 to 0.16 t/ha among cultivars in future.;http://jwcc.iwaponline.com/content/12/6/2854agronomic adaptationclimate changedssatindiayield gap |
| spellingShingle | Subhankar Debnath Ashok Mishra D. R. Mailapalli N. S. Raghuwanshi Identifying most promising agronomic adaptation strategies to close rainfed rice yield gap in future: a model-based assessment Journal of Water and Climate Change agronomic adaptation climate change dssat india yield gap |
| title | Identifying most promising agronomic adaptation strategies to close rainfed rice yield gap in future: a model-based assessment |
| title_full | Identifying most promising agronomic adaptation strategies to close rainfed rice yield gap in future: a model-based assessment |
| title_fullStr | Identifying most promising agronomic adaptation strategies to close rainfed rice yield gap in future: a model-based assessment |
| title_full_unstemmed | Identifying most promising agronomic adaptation strategies to close rainfed rice yield gap in future: a model-based assessment |
| title_short | Identifying most promising agronomic adaptation strategies to close rainfed rice yield gap in future: a model-based assessment |
| title_sort | identifying most promising agronomic adaptation strategies to close rainfed rice yield gap in future a model based assessment |
| topic | agronomic adaptation climate change dssat india yield gap |
| url | http://jwcc.iwaponline.com/content/12/6/2854 |
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