TITLE:
Effect of Elevated Air Temperature and Carbon Dioxide Levels on Dry Season Irrigated Rice Productivity in Bangladesh
AUTHORS:
M. Maniruzzaman, J. C. Biswas, M. B. Hossain, M. M. Haque, U. A. Naher, A. K. Choudhury, S. Akhter, F. Ahmed, R. Sen, S. Ishtiaque, M. M. Rahman, N. Kalra
KEYWORDS:
Maximum Temperature, Minimum Temperature, CO2 Levels, Regional Variability, Yield Compensation
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.9 No.7,
June
28,
2018
ABSTRACT: Agricultural
productivity is affected by air temperature and CO2 concentration.
The relationships among grain yields of dry season irrigated rice (Boro)
varieties (BRRI dhan28, BRRI dhan29 and BRRI dhan58) with increased
temperatures and CO2 concentrations were investigated for futuristic
crop management in six regions of Bangladesh using CERES-Rice model
(DSSATv4.6). Maximum and minimum temperature increase rates considered were 0°C, +1°C, +2°C, +3°C and +4°C and CO2 concentrations were ambient (380), 421, 538, 670 and
936 ppm. At ambient temperature and CO2 concentration, attainable
grain yields varied from 6506 to 8076 kg·ha-1 depending on rice varieties. In general, grain yield reduction would be the
highest (13% - 23%) if temperature rises
by 4°C and growth duration reduction would be 23 - 33 days. Grain yield
reductions with 1°C, 2°C and 3°C rise in temperature are likely to be compensated by increased CO2 levels of 421, 538 and 670 ppm, respectively. In future, the highest reduction
in grain yield and growth duration would be in cooler region and the least in
warmer saline region of the country. Appropriate adaptive techniques like
shifting in planting dates, water and nitrogen fertilizer management would be
needed to overcome climate change impacts on rice production.