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Estimating Irrigation Requirement for Rice Cropping under Flooding Condition using BUDGET Model
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 Title & Authors
Estimating Irrigation Requirement for Rice Cropping under Flooding Condition using BUDGET Model
Seo, Mi-jin; Han, Kyung-Hwa; Zhang, Yong-Seon; Jung, Kang-Ho; Cho, Hee-Rae;
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This study explored the effect of rainfall pattern and soil characteristics on water management in rice paddy fields, using a soil water balance model, BUDGET. In two sites with different soil textural group, coarse loamy soil (Gangseo series) and fine soil (Hwadong series), respectively, we have monitored daily decrease of water depth, percolation rate, and groundwater table. The observed evapotranspiration (ET) was obtained from differences between water depth decrease and percolation rate. The root mean square difference values between observed and BUDGET-estimated ET ranged between 10% and 20% of the average observed ET. This is comparable to the measurement uncertainty, suggesting that the BUDGET model can provide reliable ET estimation for rice fields. In BUDGET model of this study, irrigation requirement was determined as minimum water need for maintaining water-saturated soil surface, assuming 100 mm of bund height and no lateral loss of water. The model results showed different water balance and irrigation requirement with the different soil profile and indicated that minimum percolation rate by plow pan could determine the irrigation requirement of rice paddy field. For the condition of different rainfall distribution, the results presented different irrigation period and amounts, representing the importance of securing water for irrigation against different rainfall pattern.
Rice paddy field;Irrigation requirement;BUDGET;Rainfall pattern;Percolation;
 Cited by
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