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The Comparison of Water Budget and Nutrient Loading from Paddy Field According to the Irrigation Methods  

Jeon, Ji-Hong (Department of Rural Engineering, Konkuk University)
Choi, Jin-Kyu (College of Agriculture &)
Yoon, Kwang-Sik (Life Science, Inst. Agri. Science &)
Yoon, Chun-Gyeong (Technology, Chonbuk National Univ)
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Abstract
The comparison of water balance and nutrient loading from paddy field with different irrigation management were carried out during 1999 ${\sim}$ 2002 at two different sites; one is irrigated with groundwater and the other is irrigated with surface water. For the surface water irrigated paddy field, irrigation was performed continuously during growing season. Whereas, initial irrigation with groundwater was applied during initial growing season, and the ponded water depth was maintained by natural precipitation since initial irrigation. The runoff frequency of groundwater irrigated paddy field was less than that of surface water irrigated paddy field. The nutrient concentration of ponded water was high by fertilization at early cultural periods, so reducing surface drainage during fertilization period can reduce nutrient loading from paddy fields. Amount of irrigation water to surface water irrigated paddy field was higher than to groundwater irrigated paddy field and evapotranspiration was similar because it is influenced by climate. Overall input in and output from paddy field irrigated with goundwater were less than that with surface water. This study indicate that efficient water management can reduce surface drainage outflow, save water, and protect water quality. It might be important BMPs for paddy field.
Keywords
paddy field; water balance; mass balance; BMPs; water management;
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