Model development for surface drainage loading estimates from paddy rice fields |
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| Authors: | Ji-Hong Jeon Chun G Yoon Jong-Hwa Ham Kwang-Wook Jung |
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| Institution: | (1) Environmental Science Department, Konkuk University, 1 Hwayang-dong, Kwangjin-gu, Seoul, 143-701, Korea;(2) Graduate Program, Konkuk University, 1 Hwayang-dong, Kwangjin-gu, Seoul, 143-701, Korea |
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| Abstract: | A field experiment was performed at two Korean research sites to evaluate water and nutrient behavior in paddy rice culture
operations for 2 years. One site was irrigated with groundwater, whereas the other site was irrigated with surface water.
Both sites received average annual rainfall of about 1,300 mm, and about 70–80% of it was concentrated during July–September
coinciding with rice growing season. Although most of the nutrient outflow was attributed to plant uptake, nutrient loss by
surface drainage was substantial. The simplified computer model, PADDIMOD, was developed to simulate water and nutrient behaviors
in the paddy rice field. The model predicts daily ponded water depth, surface drainage, and nutrient concentrations. It was
formulated with a few equations and simplified assumptions, but its application and a model fitness test indicated that the
simulation results reasonably matched the observed data. It is a simple and practical planning model that could be used to
evaluate nutrient loading from paddy rice fields alone or in combination with other complex watershed models. Further validation
might be required for general application of the PADDIMOD to the simulation of paddy rice fields with various agricultural
environments. |
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| Keywords: | Nonpoint source modeling PADDIMOD Nutrient loading Agricultural watershed assessment |
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