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Estimation of paddy water productivity (WP) using hydrological model: an experimental study

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Abstract

Water productivity (WP) expresses the value or benefit derived from the use of water. A profound water productivity analysis was carried out at experimental field at Field laboratory, Centre for Water Resources, Anna University, India, for rice crop under different water regimes such as flooded (FL), alternative wet and dry (AWD) and saturated soil culture (SSC). The hydrological model soil-water-atmospheric-plant (SWAP), including detailed crop growth, i.e, WOFOST (World Food Studies) model was used to determine the required hydrological variables such as transpiration, evapotranspiration and percolation, and bio-physical variables such as dry matter and grain yield. The observed values of crop growth from the experiment were used for the calibration of crop growth model WOFOST. The water productivity values are determined using SWAP and SWAP–WOFOST. The four water productivity indicators using grain yield were determined, such as water productivity of transpiration (WPT), evapotranspiration (WPET), percolation plus evapotranspiration (WPET+Q) and irrigation plus effective rainfall (WPI+ER). The highest value of water productivity was observed from the flooded treatment and lowest value from the saturated soil culture in WPT and WPET. This study, reveals that deep groundwater level and high temperature reduces the crop yield and water productivity significantly in the AWD and SSC treatment. This study reveals that in paddy fields 66% inflow water is recharging the groundwater. There is good agreement between SWAP and SWAP–WOFOST water productivity indicators.

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Acknowledgments

This study was conducted as part of Ph.D research work. The first author expresses his thanks to University Grants Commission, New Delhi, India for awarding Junior Research Fellowship. He also, expresses his thanks to Dr. R. Sakthivadivel, Honorary Visiting Professor, Dr. M. Natarajan, Assistant professor, Dr. R. Mohandoss, Retired professor and Dr. N. V. Pundarikanthan, Former Director, Centre for Water Resources for their help and encouragement.

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  1. Centre for Water Resources, Anna University, Chennai, 600 025, Tamil Nadu, India

    S. Govindarajan, N. K. Ambujam & K. Karunakaran

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  1. S. Govindarajan
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  2. N. K. Ambujam
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  3. K. Karunakaran
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Correspondence to S. Govindarajan.

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Govindarajan, S., Ambujam, N.K. & Karunakaran, K. Estimation of paddy water productivity (WP) using hydrological model: an experimental study. Paddy Water Environ 6, 327–339 (2008). https://doi.org/10.1007/s10333-008-0131-0

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