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Factors Controlling the Losses of Urea through Ammonia Volatilization  

Kim, Su-Jung (Division of Biological Environment, Kangwon National University)
Yang, Jae E. (Division of Biological Environment, Kangwon National University)
Cho, Byong-Ok (Division of Biological Environment, Kangwon National University)
Kim, Jeong-Je (Division of Biological Environment, Kangwon National University)
Shin, Young-Oh (Division of Biological Sciences, Yonsei University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.40, no.1, 2007 , pp. 77-82 More about this Journal
Abstract
Volatilization of ammonia from N fertilizer is the major mechanism of N losses that occur naturally in all soils and is influenced by numerous soils, environmental and N fertilizer management factors. Vegetables are often damaged by $NH_3$ gas volatilized from the high rates of N fertilizer. We determined the rate of $NH_3$ volatilization from urea applied to surface of the alluvial soil (coarse silty, mixed, mesic family of Dystric Fluventic Eutrochrepts, Ihyeon series) as affected by fertilizer management factors such as rate of urea application, irrigation schedule and temperature. The $NH_3$ volatilization was triggered about 3 d after urea application and reached at maximum level in general within 15 days. Cumulative amounts of 3.0, 4.4, and 8.0 kg of $NH_3$ N after 17 d were volatilized at application rates of 200, 400, and $600kg\;N\;ha^{-1}$, respectively, which were equivalent to the N losses of 15.0, 10.9, and 13.0% of N applied. Masses of N volatilization were 5, 21, 75 and $87kg\;NH_3\;N\;ha^{-1}$ at 5, 8, 22, and 28, respectively. Total amounts of 21.3, 21.2, and $16.6kg\;N\;ha^{-1}$ were volatilized at control, 5 and 10 mm water irrigation before fertilization, respectively. However, those at 5 mm irrigation after fertilization were only $10.44kg\;N\;ha^{-1}$. Results showed that urea loss can be avoided by incorporating with the recommended level, applying when temperatures are low or irrigating immediately to carry the urea into soil.
Keywords
Ammonia gas; Urea; Volatilization; Temperature; Irrigation;
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