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1 Karegoudar, A. V.; Vishwanath, J.; Anand, S. R.; Rajkumar, R. H.; Ambast, S. K.; Kaledhonkar, M. J. 2019. Feasibility of controlled drainage in saline vertisols of TBP [Tungabhadra Project] command area of Karnataka, India. Irrigation and Drainage, 68(5):969-978. [doi: https://doi.org/10.1002/ird.2374]
Subsurface drainage ; Soil salinity ; Vertisols ; Irrigation water ; Groundwater table ; Cropping systems ; Rice ; Crop yield ; Nitrogen ; Rain ; Discharges / India / Karnataka / Tungabhadra Project
(Location: IWMI HQ Call no: e-copy only Record No: H049519)
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Subsurface drainage (SSD) improves crop productivity in canal command areas suffering from waterlogging and salinity problems. However, excessive drainage of paddy fields under conventional SSD is known to cause irrigation water shortage during critical growth stages of rice and also results in excessive leaching of nitrogenous fertilizers particularly at the tail end of the irrigation command. To overcome these problems farmers of the Tungabhadra Project (TBP) irrigation command used to block the outlets of lateral drains of the SSD system. In order to provide a lasting solution to this problem through a controlled drainage approach, a comparative field study was conducted on clay loam soil at the Agricultural Research Station (ARS), Gangavathi, over four seasons. In general, there was a reduction in drain discharge depth of 64% in the case of controlled drainage over conventional SSD, with an average irrigation water saving of about 17%. Average nitrogen loss was also reduced by 50.4% compared to conventional drainage. Paddy grain yield improvement was slightly higher (from 3.84 to 5.14 t ha-1) for conventional compared to controlled conditions (3.76–4.83 t ha-1)
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