Model development for surface drainage loading estimates from paddy rice fields

摘要: 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 irrigated with groundwater, whereas the other surface water. Both received average annual rainfall of about 1,300 mm, 70–80% it concentrated during July–September coinciding growing season. Although most outflow attributed plant uptake, loss by drainage substantial. The simplified computer model, PADDIMOD, developed simulate behaviors field. model predicts daily ponded depth, drainage, concentrations. It formulated a few equations assumptions, but its application fitness test indicated that simulation results reasonably matched observed data. is simple practical planning could be used loading from fields alone or combination complex watershed models. Further validation might required general PADDIMOD various agricultural environments.