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Volume 8, Issue 9 (Suppl)
J Earth Sci Clim Change
ISSN: 2157-7617 JESCC, an open access journal
Climate Congress 2017
October 16-17, 2017
October 16-17, 2017 Dubai, UAE
3
rd
World Congress on
Climate Change and Global Warming
Modeling the climate change impact of rice yield towards climate resilient future in Sri Lanka
Sarath Premalal Nissanka
1
, A S Karunaratn
2
, W M W Weerakoon
3
, B V R Punyawardena
4
, D Wallach
5
, Sonali McDermid
6
and Alex Ruane
6
1
University of Peradeniya, Sri Lanka
2
Sabaragamuwa University, Sri Lanka
3
Field Crops Research and Development Institute, Sri Lanka
4
Natural Resources Managements Centre, Sri Lanka
5
INRA, France
6
NASA GISS, USA
Statement of the Problem:
The climate projections for Sri Lanka indicate a further warming trend and rainfall variability to
become more pronounced in the future. Implications of climate change will be more severe on the rice farming since it requires
more water and cultivating areas already exposed to upper limit of maximum temperature. Therefore, this study was initiated
to quantitatively assess the impact of climate change on productivity of rice varieties by means of crop-climate modeling and
to identify adaptation measures.
Methodology & Theoretical Orientation:
A leading representative rice farming district (Kurunegala) was used. Yield
performances of commonly growing rice cultivars (Bg-300, Bg-357, Bg-358, At-308) were assessed using systematically
calibrated DSSAT version 4.5 model for baseline (1980-2010), downscaled 20 Global Climate Models (GCMs, CMIP5-RCP8.5)
for mid-century (2040-2069) and for climate sensitivities (AgMIP-C3MP) across three locations of Rajangane, Nikawaratiya
and Btalagoda in the district. Randomly selected 104 farmer survey data collected for the two growing seasons (major [October-
February] and minor [April-September]) was used for the simulation.
Findings:
Cultivation seasons of minor and major showed diverse yield performances with diverse sensitivities to climate.
Overall, major cultivation season reported that comparatively lower reduction in rice yields compared to minor season for the
actually observed climate over baseline period. According to 20 GCMs of CIMP5- RCP 8.5 climate predictions for the study
sites showed the yield drop of up to 16% in major season and it was up to 30% during minor season. Out of three sites Rjangane
reported the lowest reduction (10%) in major season compared to Nikaweratriya (19%) and Batalagoda (18%). In Contrast,
Batalagoda showed the lowest drop (24%) relatively to Rajnagane (30%) and Nikaweratiya (33%) in minor season.
Conclusion:
According to C3MP results two rice cultivar (Bg 300 and Bg 357) reported diverse yield performances with
diverse sensitivities to climate for Batalagoda.
Biography
Sarath Premalal Nissanka is a Professor in Crop Science at the Department of Crop Science, Faculty of Agriculture, University of Peradeniya. He has graduated
with a PhD in Agronomy from the University of Guelph, Canada. He has his expertise on agronomy, crop physiology and climate change and its impacts on
agriculture and forest ecosystems.
spnissanka@gmail.comSarath Premalal Nissanka et al., J Earth Sci Clim Change 2017, 8:9 (Suppl)
DOI: 10.4172/2157-7617-C1-033