Simulating Ammonia Volatilization from Applications of Different Urea Applied in Rice Field by WNMM
2008
Park, K.D. (Yeongnam Agricultural Research Institute, NICS, RDA, Milyang, Republic of Korea) | Lee, D.W. (Yeongnam Agricultural Research Institute, NICS, RDA, Milyang, Republic of Korea) | Li, Yong (The University of Melbourne, Victoria, Australia) | Chen, Deli (The University of Melbourne, Victoria, Australia) | Park, C.Y. (Yeongnam Agricultural Research Institute, NICS, RDA, Milyang, Republic of Korea) | Lee, Y.H. (Gyeongsangnam-do Agricultural Research and Extension Services, Jinju, Republic of Korea) | Lee, C.H. (Yeongnam Agricultural Research Institute, NICS, RDA, Milyang, Republic of Korea) | Kang, U.G. (Yeongnam Agricultural Research Institute, NICS, RDA, Milyang, Republic of Korea) | Park, S.T. (Yeongnam Agricultural Research Institute, NICS, RDA, Milyang, Republic of Korea) | Cho, Y.S. (National Institute of Crop Science, RDA, Suwon, Republic of Korea), E-mail: ycho@rda.go.kr
Ammonia (NH₃) volatilization from a silty clay loam paddy soil applied with non, straight urea, and coated urea, respectively, under transplanting in Milyang, Korea from 2002 and 2003 was simulated by a Water and Nitrogen Management Model (WNMM). Based on the data from the in-situ measurements, NH₃ volatilization during the rice growth was 6.04% and 1.46% of the applied nitrogen (N) from straight urea and coated urea, respectively. The bulk aerodynamic approach in WNMM satisfactorily predicted the difference in NH₃ loss during the given rice growing seasons from the two urea fertilizers. R² for the correlation between the predicted and observed NH₃ loss during the calibration year (2002) was 0.53 less than 0.68 of the application year (2003). This difference could be due to the weather condition such as heavy rainfall and temperature during the calibration year.
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