Irrigation and Drainage Systems

, Volume 8, Issue 3, pp 159–176

Irrigation crop coefficients for lowland rice

  • S. Mohan
  • N. Arumugam


Meteorological and lysimetric data for a period of nine years were used to develop crop coefficients for rice grown under lowland conditions in a sub-humid tropical climate in India. The estimated crop coefficients were found to be higher than those values recommended by FAO. A crop coefficient model with basal coefficient, moisture availability coefficient and surface wetness coefficient terms has been proposed and found suitable. On most counts, the moisture availability coefficient was found to be near unity and the wetness coefficient was found to be significant. The basal crop coefficients for lowland rice have also been presented for practical use with the proposed models.

Key words

crop coefficients evapotranspiration irrigation regression model rice 


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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • S. Mohan
    • 1
  • N. Arumugam
    • 2
  1. 1.Hydraulic & Water Resources Eng. Division, Department of Civil EngineeringIndian Institute of TechnologyMadrasINDIA
  2. 2.Research Scholar, Hydraulic & Water Resources Engg. Division, Department of Civil EngineeringIndian Institute of TechnologyMadrasIndia

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