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Estimation of Evapotranspiration ill a Rice Irrigation Scheme in Peninsular Malaysia

The correct estimation of ET in the water balance equation allows for improved water management in rice cultivation. Eight evapotranspiration estimation methods (Penman, Penman-Monteith, Pan Evaporation, Kimberly-Penman, Priestley-Taylor, Hargreaves, Samani-Hargreaves and Blaney-Criddle) were tes...

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Main Authors: Lee, Teang Shui, Mohamed Najim, Mohamed Mujithaba, Haque, Md. Aminul, Huang, Yuk Feng
Format: Article
Language:English
English
Published: Universiti Putra Malaysia Press 2005
Online Access:http://psasir.upm.edu.my/id/eprint/3876/1/Pages_from_JST_VOL._13_NO._2-10.pdf
http://psasir.upm.edu.my/id/eprint/3876/
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spelling my.upm.eprints.38762013-05-27T07:11:57Z http://psasir.upm.edu.my/id/eprint/3876/ Estimation of Evapotranspiration ill a Rice Irrigation Scheme in Peninsular Malaysia Lee, Teang Shui Mohamed Najim, Mohamed Mujithaba Haque, Md. Aminul Huang, Yuk Feng The correct estimation of ET in the water balance equation allows for improved water management in rice cultivation. Eight evapotranspiration estimation methods (Penman, Penman-Monteith, Pan Evaporation, Kimberly-Penman, Priestley-Taylor, Hargreaves, Samani-Hargreaves and Blaney-Criddle) were tested with 30 years of daily data, at a study site in the west coast of Peninsular Malaysia. The estimation of evapotranspiration by all methods showed the same trend throughout the year. The Samani-Hargreaves method gave the highest estimation followed by the Priestley-Taylor and Hargreaves methods. The Penman-Monteith method gave the lowest estimations of evapotranspiration followed by the Blaney-Criddle method and then the Pan method. The Penman-Monteith, Blaney-Criddle and Pan methods gave lower values of evapotranspiration with no significant difference among them (P = 0.05). All the other estimation methods were significantly different from these three methods. The Penman method, though was different from the three methods in terms of development; however, it estimates evapotranspiration close to these three methods. The Penman-Monteith, Blaney-Criddle and Pan were found to be the better methods to estimate evapotranspiration in the study area. Results from this study showed that the Penman method can be used to get somewhat reasonable estimates though it tends to overestimate evapotranspiration. Comparisons of these selected methods against the PenmanMonteith method showed that they have good correlation. The Pan, BlaneyCriddle and Penman gave correlation coefficients of 0.87, 0.55 and 0.97 respectively. A simple correlation equation, developed using 3D-year daily data, showed that direct measurement of net radiation can be used to estimate reference evapotranspiration with considerable accuracy (r2 = 0.97) Universiti Putra Malaysia Press 2005 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/3876/1/Pages_from_JST_VOL._13_NO._2-10.pdf Lee, Teang Shui and Mohamed Najim, Mohamed Mujithaba and Haque, Md. Aminul and Huang, Yuk Feng (2005) Estimation of Evapotranspiration ill a Rice Irrigation Scheme in Peninsular Malaysia. Pertanika Journal of Science & Technology, 13 (2). pp. 271-285. ISSN 0128-7680 English
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
English
description The correct estimation of ET in the water balance equation allows for improved water management in rice cultivation. Eight evapotranspiration estimation methods (Penman, Penman-Monteith, Pan Evaporation, Kimberly-Penman, Priestley-Taylor, Hargreaves, Samani-Hargreaves and Blaney-Criddle) were tested with 30 years of daily data, at a study site in the west coast of Peninsular Malaysia. The estimation of evapotranspiration by all methods showed the same trend throughout the year. The Samani-Hargreaves method gave the highest estimation followed by the Priestley-Taylor and Hargreaves methods. The Penman-Monteith method gave the lowest estimations of evapotranspiration followed by the Blaney-Criddle method and then the Pan method. The Penman-Monteith, Blaney-Criddle and Pan methods gave lower values of evapotranspiration with no significant difference among them (P = 0.05). All the other estimation methods were significantly different from these three methods. The Penman method, though was different from the three methods in terms of development; however, it estimates evapotranspiration close to these three methods. The Penman-Monteith, Blaney-Criddle and Pan were found to be the better methods to estimate evapotranspiration in the study area. Results from this study showed that the Penman method can be used to get somewhat reasonable estimates though it tends to overestimate evapotranspiration. Comparisons of these selected methods against the PenmanMonteith method showed that they have good correlation. The Pan, BlaneyCriddle and Penman gave correlation coefficients of 0.87, 0.55 and 0.97 respectively. A simple correlation equation, developed using 3D-year daily data, showed that direct measurement of net radiation can be used to estimate reference evapotranspiration with considerable accuracy (r2 = 0.97)
format Article
author Lee, Teang Shui
Mohamed Najim, Mohamed Mujithaba
Haque, Md. Aminul
Huang, Yuk Feng
spellingShingle Lee, Teang Shui
Mohamed Najim, Mohamed Mujithaba
Haque, Md. Aminul
Huang, Yuk Feng
Estimation of Evapotranspiration ill a Rice Irrigation Scheme in Peninsular Malaysia
author_facet Lee, Teang Shui
Mohamed Najim, Mohamed Mujithaba
Haque, Md. Aminul
Huang, Yuk Feng
author_sort Lee, Teang Shui
title Estimation of Evapotranspiration ill a Rice Irrigation Scheme in Peninsular Malaysia
title_short Estimation of Evapotranspiration ill a Rice Irrigation Scheme in Peninsular Malaysia
title_full Estimation of Evapotranspiration ill a Rice Irrigation Scheme in Peninsular Malaysia
title_fullStr Estimation of Evapotranspiration ill a Rice Irrigation Scheme in Peninsular Malaysia
title_full_unstemmed Estimation of Evapotranspiration ill a Rice Irrigation Scheme in Peninsular Malaysia
title_sort estimation of evapotranspiration ill a rice irrigation scheme in peninsular malaysia
publisher Universiti Putra Malaysia Press
publishDate 2005
url http://psasir.upm.edu.my/id/eprint/3876/1/Pages_from_JST_VOL._13_NO._2-10.pdf
http://psasir.upm.edu.my/id/eprint/3876/
_version_ 1643822739803340800
score 13.211869

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