Available Organic Carbon Controls Nitrification and Immobilization of Ammonium in an Acid Loam-Textured Soil

  • Choi, Woo-Jung (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University) ;
  • Lee, Sang-Mo (National Instrumentation Center for Environmental Management, College of Agriculture and Life Sciences, Seoul National University) ;
  • Han, Gwang-Hyun (Ecosystem Gas Exchange Team, National Institute for Agro-Environmental Sciences) ;
  • Yoon, Kwang-Sik (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University) ;
  • Jung, Jae-Woon (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University) ;
  • Lim, Sang-Sun (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University) ;
  • Kwak, Jin-Hyeob (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University)
  • 발행 : 2006.03.30

초록

Effect of organic-C on immobilization and nitrification patterns in acidic soil was examined during 20 weeks incubation period to verify if organic amendments such as composted material can increase soil retention of N by stimulating microbial immobilization of $NH_4^+$. Four treatments were laid out: control without fertilizer N and glucose (treatment code: S), ammonium sulfate (SN), ammonium sulfate with single glucose at the commencement (0 week) of incubation (SNG), and ammonium sulfate with double glucose at 0 and 4 weeks of incubation (SNGG). Glucose application (SNG) significantly increased microbial immobilization of $NH_4^+$ within 1 week of incubation over SN. Immobilization was followed by remineralization thereafter; however, second-application of glucose (SNGG) restored $NH_4^+$ immobilization. At the same time, nitrification was significantly inhibited by glucose application as indicated by consistently low $NO_3^-$ concentration in SNG and SNGG soils, suggesting that microbial assimilation of $NH_4^+$ is predominant compared to nitrification when available C-source is abundant. These results suggest application of chemical fertilizer-N with organic amendment would have beneficial effect on soil-N retention and environmental conservation by reducing production of $NO_3^-$ which is likely to be lost through leaching or denitrification.

키워드

참고문헌

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