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Evaluation of Fate of $NH_4{^+}$ of Condensed Molasses Solubles(CMS) in Soil Using by $^{15}N$-Tracer Method  

Lee, Sang-Mo (National Instrumentation Center for Environmental Management, Seoul National University)
Choi, Woo-Jung (School of Agricultural Biotechnology, Seoul National University)
Yun, Seok-In (School of Agricultural Biotechnology, Seoul National University)
Choi, Young-Dae (School of Agricultural Biotechnology, Seoul National University)
Ro, Hee-Myong (School of Agricultural Biotechnology, Seoul National University)
Park, Jee-Won (GBRC Co. Ltd.)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.35, no.2, 2002 , pp. 69-76 More about this Journal
Abstract
To study the behavior of $NH_4{^+}$ of CMS (condensed molasses solubles) in soil, a laboratory incubation experiment was conducted during a period of up to 21 days at $25^{\circ}C$. The $NH_4{^+}$ of CMS was labeled with $^{15}N$ and was applied to water-unsturated and water-saturated conditions. Soil pH was gradually decreased from 6.1 to 5.4 under unsaturated condition. However, soil pH was increased to 6.5 within 2 days under saturated condition and then was constant. The concentration of ammonium was decreased 3 times faster under unsaturated condition than under saturated condition. The concentration of nitrate was increased from 17.4 to $155.4mg\;kg^{-1}$ under unsaturated condition. But concentration of nitrate was kept with low(below $8.0mg\;kg^{-1}$) under saturated condition. During the incubation, 52.4% of $^{15}NH_4{^+}$ applied was existed in the form of $NO_3{^-}$ by nitrification under unsaturated condition. Most of applied nitrogen was immobilized within 4 days of incubation. On 21 days of the incubation the percentage of immobilized nitrogen derived from $^15NH_4{^+}$(NDFA) was 19.6% under unsaturated condition and 17.0% under saturated condition. The percentage of unaccounted N, which was lost by denitrification, was 28.4% under unsturated condition and 67.6% under saturated condition.
Keywords
CMS; $^{15}N$ tracer; nitrification; immobilization; denitrification;
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