Panya Polsan, Daisuke Komori, Sanguan Patamatamkul, Masatoshi Aoki and Wonsik Kim
Release Date: September 19, 2009

Practical Estimation of Evapotranspiration in Rice Cultivation in Thailand
Panya Polsan1)2), Daisuke Komori3), Sanguan Patamatamkul4), Masatoshi Aoki5) and Wonsik Kim6)

1) Doctoral student of Water Resources Engineering, Khon Kaen University
2) Hydrology and Water Management Center for Lower Northern Region, Royal Irrigation Department
3) Institute of Industrial Science, The University of Tokyo
4) Faculty of Water Resources Engineering, Khon Kaen University
5) Faculty of Agriculture, Tokyo University of Agriculture and Technology
6) National Institute for Agro-Environmental Sciences

(Received: August 27, 2009)
(Accepted for publication: September 10, 2009)

Abstract:
A reliable, practical method for estimating the evapotranspiration associated with rice cultivation is vital for proper water management in Thailand. We investigated the possibility of estimating rice-related evapotranspiration using only daily air temperature and wind speed, as a practical method for local application in Thailand. By applying regression analysis to a theoretical investigation, we developed a set of daily based equations that estimated evapotranspiration of rice cultivation for a typical Thai plains environment during the rainy season. The estimation error of the developed equations was approximately 20% on a daily scale, and 10% on a weekly scale. Although additional validation of the derived equations is needed for application at other location and at other times of the year, the developed equations show potential for use in water management of cultivation in Thailand.

[Full Text]

To cite this article:
Panya Polsan, Daisuke Komori, Sanguan Patamatamkul, Masatoshi Aoki and Wonsik Kim: “Practical Estimation of Evapotranspiration in Rice Cultivation in Thailand”, Hydrological Research Letters, Vol. 3, pp.41-44, (2009) .

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doi:10.3178/hrl.3.41
JOI JST.JSTAGE/hrl/3.41
Copyright (c) 2009 Japan Society of Hydrology and Water Resources