Modeling Water Balance Parameters for Rainfed Rice
Publication: Journal of Irrigation and Drainage Engineering
Volume 130, Issue 2
Abstract
A field water balance model is developed for rainfed rice in medium land (a rice field with intermittent ponding and drying phase is characterized as medium land) in eastern India with provision of supplemental irrigation from an on-farm reservoir. The model inputs consist of soil, crop, and daily climatic data. By developing a computer program in Visual Basic 6.0, the model simulates various water-balance parameters such as actual evapotranspiration, percolation, seepage, supplemental irrigation, surface runoff, and ponding depth in the field on a daily basis. Physically based saturated and unsaturated flow processes are incorporated into the model to simulate the aforesaid model parameters that occur during wet and dry periods. The model parameters are validated with the observed data of the experimental field. The Z-test was used to look for significant differences between the observed and simulated values of the parameters. The model hypothesis is found to be acceptable at a 5% level of significance for simulating the actual evapotranspiration and ponding depth and at the 1% level of significance for simulating percolation.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 130 • Issue 2 • April 2004
Pages: 129 - 139
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jul 2, 2002
Accepted: Jun 10, 2003
Published online: Mar 15, 2004
Published in print: Apr 2004
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