Impact of climate change scenario on rice production in two planting methods: a simulation study|
Sumathi, A.; Mohandass, S. & Ramasamy, S.
In the present study, attempts have been made
to simulate the effect of climate change on rice growth and
yield, under both control and water-stressed conditions.
Between the two planting methods, the system of rice
intensification (SRI) practice had an advantage for the
elevated CO2 conditions, with an additional yield of
1,325 kg ha-1; while it was only 391 kg ha-1 under traditional
system of planting rice (TPR). Similarly, the yield
decline due to temperature increment was -2.0, -2.4,
-6.2 and -12.8 % under SRI practice as compared to that
of -4.0, -9.9, -11.3 and -31.7 % in the TPR system for
+1, +2, +3 and +4 °C temperature rise, respectively.
Thus, doubling of atmospheric CO2 level will compensate
for the detrimental effect of increased temperature up to
2 °C in the SRI method of rice cultivation as compared to
TPR system of planting. Thus, SRI practice is the most
suitable method of rice cultivation under both elevated CO2
and temperature level. Simulation analysis of the present
data using the dynamic model, ORYZA2000, indicated that
under future adverse climatic conditions, the grain yield
showed little variation (+1.83 %) with doubled CO2 at
+2 °C temperature rise especially with the water stress
situations. However, this could be further raised
(+17.10 %) with the supplementation of pink-pigmented
facultative methylotroph bacterium (PPFM) bio-fertilizer
in the given scenario. Thus, temperature-induced yield
alterations especially under water-stressed environment
could be favorably mitigated with the CO2 fertilization
along with the supplementation of PPFM bio-fertilizer.
Crop modeling; Elevated carbon dioxide; ORYZA2000; System of rice intensification; Temperature; Water stress