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Evaluating the yield potential of C4 rice across South and East Asia

Poothakuzhiyil Haridasan, Deepak (2021) Evaluating the yield potential of C4 rice across South and East Asia.

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Abstract:The food security for the future humanity is threatened by many factors like climate change, urbanization and soil degradation, etc. To fight against this crisis, new high yielding and resilient crop varieties should be developed. Studies are ongoing to develop such crop varieties like new C4 rice. But once the variety is developed and ready for cultivation, the community of practice like agricultural researchers, food security analysts, seed companies, etc. may wonder which region and under what agro-climatic conditions these new varieties outperform the traditional varieties and vice versa. In the present study a light use efficiency model (LUE) named Production Efficiency Model Optimized for Crops (PEMOC) was selected to estimate the crop yield for traditional C3 rice and new C4 rice across south and east Asia. The study also compared the estimated yield of C3 and C4 latitudinally and country-wise corresponding to baseline climatic conditions and future Representative Concentration Pathway (RCP) scenarios. Earlier studies showed that PEMOC can estimate the yield of rice with the coefficient of determination value of 0.75. The model uses only four input parameters such as normalized difference vegetation index, average temperature, solar radiation, and vapour pressure deficit (VPD) and suitable for regional-scale studies. The seasonal average values of NDVI and climatic parameters were calculated from 1982 to 2015 and used as the input parameters for baseline. Also, seasonal average values of the temperature projections corresponding to different RCPs were used for future yield estimation. The result showed that at higher latitudes C3 crops perform well due to mild temperature and in the mid-latitude around 30o the difference in yield between C3 and C4 is very less. When it comes to the tropic region, the C4 rice performs better. The country-wise comparison showed that the countries that lie in higher latitude do not get much benefit from C4 rice in the current climatic condition. But in the future, at elevated temperatures, all countries showed positive responses towards the C4 rice yield
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
Link to this item:https://purl.utwente.nl/essays/88979
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