American Journal of Water Resources
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American Journal of Water Resources. 2018, 6(1), 1-8
DOI: 10.12691/ajwr-6-1-1
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Trends in Climatic Variables and Their Impact on Crop Water Requirement and Crop Production

Arpita Islam1, and A.T.M. Hasan Zobeyer1

1Department of Water Resources Engineering (DWRE), Bangladesh University of Engineering and Technology Dhaka, Bangladesh

Pub. Date: January 22, 2018

Cite this paper:
Arpita Islam and A.T.M. Hasan Zobeyer. Trends in Climatic Variables and Their Impact on Crop Water Requirement and Crop Production. American Journal of Water Resources. 2018; 6(1):1-8. doi: 10.12691/ajwr-6-1-1


Climate change have innumerable potential effects on agricultural production which is a key economic sector in Bangladesh. Bogra, Rangpur and Rajshahi in the north-west region have been selected as the study area. This paper aims to investigate the combined effects of climatic variables on ETo and NIR and to estimate the yield of the crop Boro and Aman in these study area. For testing the statistical significance of trends in different agro-climatic variables both parametric and non-parametric methods are used. The results of the analysis reveal that maximum temperature has decreasing trends of 0.20c, 0.10c and 0.30c per decade at Bogra, Rajshahi and Rangpur station and relative humidity has increasing trends in most 10-day periods. Sunshine hour and solar radiation show decreasing trends and minimum temperature and wind speed show increasing trends. It is found that ETo has decreasing trends at Bogra, Rangpur and Rajshahi station which are 0.41, 0.35 and 0.15 mm/day respectively per decade. NIR shows decreasing trend of 0.0428, 0.021 and 0.0434 mm/day per decade at those stations respectively. Sensitivity analysis was done in terms of percentage change in temperature, wind speed, relative humidity and radiation to identify the relative importance of climatic variables on Eto. Though the temperature is increasing due to global warming and it has a positive effect on ETo and NIR, the changes in other climatic variables are more prominent than the changes in temperature which result in a decrease in ETo and NIR. Aqua Crop version 4.0 software was used to estimate the crop yield Boro and Aman at the three stations. At Rajshahi station yield of Boro and Aman is found to be 6.407 and 4.732 tons per hectare respectively. At Bogra station, yield of Boro and Aman is 6.407 and 3.66 tons per hectare. The yield of Boro is found to be 6.42ton per hectare at Rangpur station. These values are found to be relatively close to the values obtained from the Agricultural Statistics Report, 2011of BBS.

crop water requirement evapotranspiration boro amon aquacrop

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[1]  IPCC, 2007. Climate Change 2007: Impacts, Adaptation and Vulnerability, Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Working Climate Change, Cambridge University Press.
[2]  Karmakar, S. and Shrestha, M. L. 2000. Recent climatic changes in Bangladesh. SMRC. 4: 1-43.
[3]  T. Persson, 1999.Solar radiation climate in Sweden. Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere, Vol 24, Issue 3, 1999Page-275-279.
[4]  Zhang, Y.L., Qin, B.Q. Qin and W.M. Chen, W.M. 2003. Analysis of 40 year records of solar radiation data in Shanghai, Nanjing andHangzhou in Eastern China, Theoritical Applied Climatology, 78, 217-227, Springer-Verlag.
[5]  Ahmed, A. A., Ameen, J. A. and Mahmood, M.S., 2007. Statistical Analysis of Recent Changes in Relative Humidity in Jordan, American Journal of Environmental Sciences, 3(2), 75-77.
[6]  Tuller, S.E., 2004. Measured Wind Speed Trends on the West Coast of Canada, International Journal of Climatology, 24(11), 1359-1374.
[7]  Chattopadhyay N, and Hulme M, 1997, “Evaporation and Potential Evapotranspiration in India under Conditions of Recent and Future Climate Change”, Agric. Forest Meteor, Vol. 87, No. 55-73.
[8]  Goyal, R.K., 2004. Sensitivity of Evapotranspiration to Global Warming: a Case Study of Arid Zone of Rajasthan (India), Agricultural Water Management, 69 (1), 1-11, Elsevier.
[9]  Ahmed, A.U. and Alam, M., 1999. Development ofClimate Change Scenario with General Circulation Models. In S.Huq, Z. Karim, M. AsadUzzamnan and F. Mahtab (eds.), Vulnerability and Adaptation to Climate Change for Bangladesh: 13-20, Kluwer Academic Publishers, Dordecht, The Netherlands.
[10]  Ramirez,J.A and Finnerty,B.,1996.CO2 and Temperature Effects on Evapotranspiration and Irrigated Agriculture, Journal of Irrigation and Drainage Engineering, vol 122, issue 3,155-163.