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Development and validation of an unsaturated soil water flow model for oil palm

The development and use of a soil water model to predict the soil water flow and content under oil palm would be useful as a tool for more effective oil palm water management. Although many soil water models exist, none of them has been specifically developed, applied, and validated for oil palm. Co...

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Main Author: Teh, Christopher Boon Sung
Format: Article
Language:English
Published: Universiti Putra Malaysia Press 2018
Online Access:http://psasir.upm.edu.my/id/eprint/64495/1/20%20JTAS%20Vol%2041%20%282%29%20May%202018_JTAS-1269-2017_pg787-800.pdf
http://psasir.upm.edu.my/id/eprint/64495/
http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JTAS%20Vol.%2041%20(2)%20May.%202018/20%20JTAS%20Vol%2041%20(2)%20May%202018_JTAS-1269-2017_pg787-800.pdf
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spelling my.upm.eprints.644952018-07-06T09:17:25Z http://psasir.upm.edu.my/id/eprint/64495/ Development and validation of an unsaturated soil water flow model for oil palm Teh, Christopher Boon Sung The development and use of a soil water model to predict the soil water flow and content under oil palm would be useful as a tool for more effective oil palm water management. Although many soil water models exist, none of them has been specifically developed, applied, and validated for oil palm. Consequently, the purpose of this study is to develop and validate such a model. Water flow was modelled following a one-dimensional "tipping bucket" system, and the soil profile was divided into several soil layers where the soil water and hydraulic characteristics for each layer were estimated based on the soil carbon content and soil texture. Darcy's law was applied to estimate the various soil water fluxes. The soil water model included algorithms to estimate the root water uptake and water stress response by oil palm. Raw data of measured soil water content for several soil depths (up to 90 cm) from two studies (Moraidi et al., 2015; Nur Farahin, 2013) were obtained, so that the accuracy of the soil water model could be validated by comparing simulations of soil water content with measured values. The model was satisfactorily accurate, showing similar daily trend as that observed for the measured soil water content. Goodness-of-fit indexes further indicated that the model simulations showed little to no overall model bias and with an average absolute prediction error of only 10%. Future work is to increase model accuracy by estimating the daily actual evapotranspiration instead as assumed constant in this study. Universiti Putra Malaysia Press 2018 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/64495/1/20%20JTAS%20Vol%2041%20%282%29%20May%202018_JTAS-1269-2017_pg787-800.pdf Teh, Christopher Boon Sung (2018) Development and validation of an unsaturated soil water flow model for oil palm. Pertanika Journal of Tropical Agricultural Science, 41 (2). pp. 787-800. ISSN 1511-3701; ESSN: 2231-8542 http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JTAS%20Vol.%2041%20(2)%20May.%202018/20%20JTAS%20Vol%2041%20(2)%20May%202018_JTAS-1269-2017_pg787-800.pdf
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description The development and use of a soil water model to predict the soil water flow and content under oil palm would be useful as a tool for more effective oil palm water management. Although many soil water models exist, none of them has been specifically developed, applied, and validated for oil palm. Consequently, the purpose of this study is to develop and validate such a model. Water flow was modelled following a one-dimensional "tipping bucket" system, and the soil profile was divided into several soil layers where the soil water and hydraulic characteristics for each layer were estimated based on the soil carbon content and soil texture. Darcy's law was applied to estimate the various soil water fluxes. The soil water model included algorithms to estimate the root water uptake and water stress response by oil palm. Raw data of measured soil water content for several soil depths (up to 90 cm) from two studies (Moraidi et al., 2015; Nur Farahin, 2013) were obtained, so that the accuracy of the soil water model could be validated by comparing simulations of soil water content with measured values. The model was satisfactorily accurate, showing similar daily trend as that observed for the measured soil water content. Goodness-of-fit indexes further indicated that the model simulations showed little to no overall model bias and with an average absolute prediction error of only 10%. Future work is to increase model accuracy by estimating the daily actual evapotranspiration instead as assumed constant in this study.
format Article
author Teh, Christopher Boon Sung
spellingShingle Teh, Christopher Boon Sung
Development and validation of an unsaturated soil water flow model for oil palm
author_facet Teh, Christopher Boon Sung
author_sort Teh, Christopher Boon Sung
title Development and validation of an unsaturated soil water flow model for oil palm
title_short Development and validation of an unsaturated soil water flow model for oil palm
title_full Development and validation of an unsaturated soil water flow model for oil palm
title_fullStr Development and validation of an unsaturated soil water flow model for oil palm
title_full_unstemmed Development and validation of an unsaturated soil water flow model for oil palm
title_sort development and validation of an unsaturated soil water flow model for oil palm
publisher Universiti Putra Malaysia Press
publishDate 2018
url http://psasir.upm.edu.my/id/eprint/64495/1/20%20JTAS%20Vol%2041%20%282%29%20May%202018_JTAS-1269-2017_pg787-800.pdf
http://psasir.upm.edu.my/id/eprint/64495/
http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JTAS%20Vol.%2041%20(2)%20May.%202018/20%20JTAS%20Vol%2041%20(2)%20May%202018_JTAS-1269-2017_pg787-800.pdf
_version_ 1643838040737579008
score 13.211869

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