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Representation of rainfed valley ricefields using a soil-water balance model

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  • de Silva, C. Shanthi
  • Rushton, K.R.

Abstract

Soil-water conditions for ricefields located in valleys in micro-catchments are simulated using a daily soil-water balance model. The crop is primarily rainfed but there is also limited irrigation water. The simulation covers a complete year and includes features such as rainfall, irrigation releases, runoff from uplands, actual evaporation and evapotranspiration, percolation losses through the bed and bunds of the ricefield, standing water in the field and overflows from the ricefield. A specific location in Sri Lanka is selected to illustrate the approach. The impacts of different conditions are explored including alternative irrigation releases, increased losses through the bed and bunds of the ricefield and a lower overflow from the ricefield. Simulations indicate that ricefields which are towards the valley sides have an increased inflow due to runoff from adjacent uplands; this can lead to improved rice yields. However, reducing heights of the bunds to half the original value results in substantial overflows during periods of high rainfall while the number of days without submergence almost doubles. This uncomplicated model is consistent with the limited field data and information available; it provides a realistic representation of the important processes and indicates why poor crop yields often occur.

Suggested Citation

  • de Silva, C. Shanthi & Rushton, K.R., 2008. "Representation of rainfed valley ricefields using a soil-water balance model," Agricultural Water Management, Elsevier, vol. 95(3), pages 271-282, March.
    • Handle: RePEc:eee:agiwat:v:95:y:2008:i:3:p:271-282
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