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Simulating Nitrogen and Irrigation Effects on Wheat Production in Bangladesh under Changing Climate

American Journal of Plant Sciences 2017年第7期8卷 1593-1606页

作者： Ranjit Sen Apurba Kanti Choudhury sohela akhter Sheikh Ishtiaque Md. Abu Hena Sorwar Jahan Faruque Ahmed Jatish Chandra Biswas Md. Maniruzzaman Md. Main Uddin Miah Md. Mizanur Rahman Naveen Kalra Md. Abdul Aziz A. S. M. Mahbubur Rahman Khan Bangladesh Agricultural Research Institute Gazipur Bangladesh Bangladesh Rice Research Institute Gazipur Bangladesh Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh CRP-II Project Krishi Gobeshona Foundation (KGF) Dhaka Bangladesh

Climate change impacts are visible in Bangladesh which requires adoption of judicious crop management practices for sustainable agriculture. Crop simulation models are effective in this regard and can be used for optimizing water and nitrogen inputs for maximization of wheat yields. Two field studies were conducted at Bangladesh Agricultural Research Institute (BARI) for evaluating the effect of increased temperature on wheat production under variable water and N rates, through the use of DSSAT v4.6 model. Thirty years historic weather data and BARI Gom-26 wheat-cultivar coefficients, as generated through use of GLUE of DSSAT model, were used for evaluating the impact of temperature rise with variable rates of irrigation water and nitrogen. The effects of four levels of nitrogen (0, 40, 80 and 120 kg ha-1) and four irrigation levels [0 (no irrigation), 1, 2 and 3] on wheat yield were evaluated under 0°C, 1°C, 2°C and 3°C rise in temperature. Simulation results indicated that wheat yield increased with increase in nitrogen application rate, but decreased with the temperature rise. Crop growing duration was reduced by about five days for each degree rise in temperature, irrespective of levels of irrigation water and nitrogen-rates. In general, there was yield reduction of 8.13, 16.77 and 24.97 % with increased temperature of 1°C, 2°C and 3°C, respectively, when compared with no temperature rise treatment. For interaction of temperature rise-N dose, the magnitude of yield decline under temperature rise was higher with increased dose of N. Agronomic N use efficiency at different N rates and temperature rise level were calculated. N use efficiency decreases with the increase in temperature rise and the highest (29.95 kg grain kg-1 N) was obtained from 40 kg N ha-1 treated plot with 0°C temperature rise i.e. existing atmospheric temperature. Simulation results indicated increase in wheat yield with higher levels of irrigation water, and interaction of irrigation level with temperature ri

关键词： Climate Change Wheat Temperature Rise Irrigation Nitrogen Bangladesh

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