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Ammonia Volatilization from Coated Urea in Paddy Soil of Transplanting Rice Culture  

Lee, Dong-Wook (Yeongnam Agricultural Research Institute, NICS, RDA)
Park, Ki-Do (Yeongnam Agricultural Research Institute, NICS, RDA)
Park, Chang-Young (Yeongnam Agricultural Research Institute, NICS, RDA)
Kang, Ui-Gum (Yeongnam Agricultural Research Institute, NICS, RDA)
Son, Il-Soo (Yeongnam Agricultural Research Institute, NICS, RDA)
Yun, Eul-Soo (Yeongnam Agricultural Research Institute, NICS, RDA)
Park, Sung-Tae (Yeongnam Agricultural Research Institute, NICS, RDA)
Lee, Suk-Soon (School of Biological Resources, Yeungnam University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.38, no.6, 2005 , pp. 321-327 More about this Journal
Abstract
Ammonia ($NH_3$) volatilization was measured from latex coated urea (LCU) and normal urea treated rice paddy under transplanting rice culture in Milyang in 2002 and 2003. The $NH_3$ volatilization from incubation experiment was significantly related with ammonium-N ($NH_4-N$) concentration and pH in the surface water. The correlation coefficients of $NH_3$ volatilization compared to the $NH_4-N$ and pH in surface water were significantly higher in urea than LCU. The $NH_3$ volatilization from both urea and LCU treatments was not increased in surface water of pH less than 8.0, while $NH_3$ volatilization increased significantly in the surface water of pH over 8.0. The results in the field experiment indicated that $NH_3$ volatilization after top-dressing of urea increased rapidly with increasing $NH_4-N$ concentration in soil and floodwater, and highest from 7 to 10 days after top-dressing. The amount of $NH_3$ volatilized from urea treatment was in the range of $4.9-8.4kg\;N\;ha^{-1}$. The variations of $NH_3$ volatilization in 2002 and 2003 were caused by changed N dynamics due to the different weather conditions such as rainfall and temperature. The amount of $NH_3$ volatilized from LCU treatment was significantly reduced compared to that of urea. The reason for the reduced $NH_3$ volatilization in LCU treatment would be due to the lower concentration of $NH_4-N$ in floodwater. The amount of $NH_3$ volatilized from LCU treated rice paddy was in the range of $1.2-1.8kg\;N\;ha^{-1}$, and the loss of N by ammonia volatilization was 2.0-2.3%. Loss of N by $NH_3$ volatilization with LCU treatment was reduced by 75-79% comparing to urea treatment.
Keywords
Ammonia volatilization; Coated urea; Rice; Transplanting;
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