NAME =  Panya Polsan  
ORGANIZATION =  Royal Irrigation Department,  
ADDRESS =  Hydrology and Water Management Center, Tha Thong, Muang, Phitsanulok 65000  
COUNTRY =  Thailand  
PHONE =  66-1-9723498  
FAX =  66-55-245461  
E-MAIL =  ppolsan@hotmail.com  
POSTER_ONLY =  no  
THEME =  T5  
DATE =  02-Aug-04-13:14:28  
ABSID = T5PP02Aug04131428 
TITLE = Evapotranspiration Estimation of Paddy Field in Thailand Utilizing Limited Meteorological Data 
AUTHOR_1 = Panya  Polsan 
INSTITUTION_1 = Ph. D student in Water Resource Engineering Programme, Khon Kaen University, Thailand 
PRESENTER = AUTHOR_1 
AUTHOR_2 = Masatoshi  Aoki 
INSTITUTION_2 = Prof.Dr. Tokyo University of Agriculture and Technology, Japan 
AUTHOR_3 = Sanguan  Patamatamkul 
INSTITUTION_3 = Khon Kaen University, Thailand 
ABSTRACT =        Evapotranspiration (Et) information used for irrigation scheduling may benefit farmers in increasing the irrigations area and evaluating amount of water applied. In Thailand, there are several methods of evapotranspiration estimating. The Bowen ration technique is the method of evapotranspiration estimating which is firstly applied to paddy field in Thailand. This research is attempted to generate the basic meteorological data which are necessary for formulating simple model to determine evapotranspiration. The model is simplified evapotranspiration from Bowen ratio technique with linear regression method using basic meteorological data. By comparing evapotranspiration from simple model with evapotranspiration from Bowen ratio method, it shows the similar pattern of distribution over a year.  Therefore, in the paddy field area of  which limited meteorological data, the simple model can be applied for evapotranspiration  estimating.