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Projecting Future Crop Evapotranspiration and Irrigation Requirement of Potato in Lower Gangetic Plains of India using the CROPWAT 8.0 Model

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Abstract

A study on evapotranspiration from potato fields was conducted in the Lower Gangetic Plains of India. The input data required for the CROPWAT irrigation management model was collected, and evapotranspiration (ET) and irrigation water requirement (IWR) for potato crops were calculated using the model. Firstly, the CROPWAT model was validated by comparing simulated crop evapotranspiration (SET) with actual ET calculated through the field water balance method. Thereafter, SET and IWR for nine locations in the lower Gangetic plains of India were calculated for the period from 1996–1997 to 2008–2009, for the current situation (using 20-year-average weather data of the stations), and for elevated thermal conditions, i.e. considering 2 and 3 °C increases over the current temperature. The future change in IWR for potato up to 2050 was also calculated considering the projected climatic scenario generated by the PRECIS model. The CROPWAT calculated IWR values showed an increasing, though not statistically significant, trend in requirement of irrigation water for potato across the nine locations during the period from 1996–1997 to 2008–2009. At a temperature increase of 2 °C over normal, the mean SET of potato would increase by 0.06 mm per day and the average IWR would be 6.0 mm per season more. If the mean temperature would be 3 °C more than normal, the SET would be 0.16 mm day−1 higher and the IWR 16.6 mm. Also based on the projected climatic scenario generated by the PRECIS model, the future SET up to 2050 showed an increasing trend. The present study indicates increasing demand for irrigation water, which may significantly affect the agricultural scenario in the region.

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Acknowledgments

The help and support from Director of Research, Bidhan Chandra Krishi Viswavidyalaya and Dr. M. Bose, Professor, Jadavpur University, are duly acknowledged. Mrs. Renaissance Banerjee helped a lot in editing the manuscript.

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Authors and Affiliations

  1. AICRP on Agrometeorology, Directorate of Research, BCKV, Kalyani, West Bengal, 741235, India

    Saon Banerjee

  2. River Research Institute, Mohanpur, Nadia, West Bengal, 741252, India

    S. Chatterjee

  3. Department of Agricultural Meteorology and Physics, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, 741252, India

    S. Sarkar

  4. JRS, OUAT, Kendrapara, Odisha, India

    S. Jena

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  1. Saon Banerjee
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  2. S. Chatterjee
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Correspondence to Saon Banerjee.

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Banerjee, S., Chatterjee, S., Sarkar, S. et al. Projecting Future Crop Evapotranspiration and Irrigation Requirement of Potato in Lower Gangetic Plains of India using the CROPWAT 8.0 Model. Potato Res. 59, 313–327 (2016). https://doi.org/10.1007/s11540-016-9327-7

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