Ammonia (NH3) volatilization from a silty clay loam paddy soil applied with non, normal urea and coated urea, respectively, under transplanting practice in Miryang, Korea from 2002 and 2003 was simulated by a Water and Nitrogen Management Model (WNMM) compared against the field measurement. Based on the data of the in-situ field measurements, the NH3 volatilization during whole rice growing season was 1.46% of applied N for coated urea compared to 6.04% for normal urea. In WNMM, the bulk aerodynamic approach was used to simulate the NH3 volatilisation from paddy water surface. As a result, the WNMM predictions of NH3 volatilization during these two rice growing seasons (2002 and 2003) were satisfactory to distinguish the applications of two urea forms, but slightly less than the field measurements. In addition, the R
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