Model for Nonlinear Root Water Uptake Parameter
Publication: Journal of Irrigation and Drainage Engineering
Volume 138, Issue 10
Abstract
An empirical relationship is developed for the nonlinear root water uptake parameter in the O-R moisture uptake model from easily measurable plant physiological parameters, such as maximum daily transpiration, maximum root depth, and time to attain the maximum transpiration. A nondimensional parameter, termed specific transpiration, that involves the plant physiological parameters is used in this empirical relationship. Data for determining this relationship are obtained by minimizing the deviations between the field observed moisture depletions of 28 crops reported in the literature, and the Richards equation–based numerically simulated soil moisture depletions combined with the moisture uptake model accounting for root water uptake. In addition to cross-validation, field experiments on three Indian crops (maize, Indian mustard, and wheat) are conducted to further validate the proposed empirical relationship. Comparisons of model predictions with field observations of soil moisture profiles and moisture depletions in different layers of the root zone show good agreement during different stages of crop growth. The results highlight the utility of the developed equation for modeling root water uptake over a wide range of crops.
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Acknowledgments
The financial support by the Department of Science and Technology, Government of India, for the study is gratefully acknowledged. The writers wish to express their sincere thanks to Ms. Jennifer M. Smith, Administrative Associate, College of Agriculture and Life Sciences, Agriculture Experiment Station, Tucson, Arizona for providing published evapotranspiration, crop water use, and moisture depletion data in the form of Technical Bulletin No. 169, Agricultural Experiment Station, University of Arizona, Tucson, Arizona, from the Library of the University of Arizona.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 138 • Issue 10 • October 2012
Pages: 905 - 917
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Apr 23, 2011
Accepted: Feb 28, 2012
Published online: Mar 3, 2012
Published in print: Oct 1, 2012
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