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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/9241
Title: Soil moisture dynamics modeling considering the root compensation mechanism for water uptake by plants
Authors: Yadav, Brijesh K.
Mathur S.
Siebel M.A.
Published in: Journal of Hydrologic Engineering
Abstract: A numerical model is developed in this study for simulating soil moisture flow in layered soil profile with plant growth. A dynamic root compensation mechanism (RCM) is used for a nonuniform root distribution pattern to compute water uptake by plants in a moisture scarce environment. The governing soil moisture flow equation integrated with the roots water uptake function is solved numerically by the implicit finite difference method coupled with the Picard iteration technique. The model is first tested for a barren layered soil profile using numerical simulation data available in the literature. A nonlinear function for water uptake by roots is then incorporated in the flow equation and the rate of water removal is simulated with and without considering the RCM for a characteristic example under optimal and water scare conditions. The model is finally applied to a rain-fed wheat (Triticum aestivum) field using a dynamic root growth model. The simulation considering the RCM shows better agreement with the observed data compared to the model results obtained without considering the RCM. Results show that under favorable soil moisture conditions, plants extract water at the maximum rate according to the root distribution pattern and when the moisture stress is developed in the upper soil profile, the diminished water uptake rate in the water scarce region is compensated for by an enhanced water uptake from the lower wetter layers. The model can be used for sound irrigation management practices especially in the water scarce arid and semiarid regions and can also be integrated with a transport equation to predict the solute uptake by plant root biomass. © 2009 ASCE.
Citation: Journal of Hydrologic Engineering (2009), 14(9): 913-922
URI: https://doi.org/10.1061/(ASCE)HE.1943-5584.0000066
http://repository.iitr.ac.in/handle/123456789/9241
Issue Date: 2009
Keywords: Arid lands
Crops
Numerical models
Soil water
ISSN: 10840699
Author Scopus IDs: 57209494362
55434325100
6604081434
Author Affiliations: Yadav, B.K., Dept. of Environmental Resources, Institute for Water Education, UNESCO-IHE, P.O. Box 3015, 2601 DA Delft, Netherlands
Mathur, S., Dept. of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 11016, India
Siebel, M.A., Dept. of Environmental Resources, Institute for Water Education, UNESCO-IHE, P.O. Box 3015, 2601 DA Delft, Netherlands
Corresponding Author: Yadav, B.K.; Dept. of Environmental Resources, Institute for Water Education, UNESCO-IHE, P.O. Box 3015, 2601 DA Delft, Netherlands; email: brijeshy@gmail.com
Appears in Collections:Journal Publications [HY]

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