Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Nitrogen Dynamics in Soil Amended with Different Rate of Nitrogen Fertilizer

  • Kim, Sung Un (Department of Life Science & Environmental Biochemistry, Pusan National University) ;
  • Choi, Eun-Jung (National Academy of Agricultural Science, RDA) ;
  • Jeong, Hyun-Cheol (National Academy of Agricultural Science, RDA) ;
  • Lee, Jong-Sik (National Academy of Agricultural Science, RDA) ;
  • Lee, Hyun Ho (Department of Life Science & Environmental Biochemistry, Pusan National University) ;
  • Park, Hye Jin (Department of Life Science & Environmental Biochemistry, Pusan National University) ;
  • Hong, Chang Oh (National Academy of Agricultural Science, RDA)
  • Received : 2017.11.07
  • Accepted : 2017.11.15
  • Published : 2017.12.31
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Abstract

Excessive application of nitrogen (N) fertilizer to support switchgrass growth for bioenergy production may cause adverse environmental effects. The objective of this study was to determine optimum N application rate to increase biomass yield of switchgrass and to reduce adverse environmental effects related to N. Switchgrass was planted in May 2008 and biomass yield, N uses of switchgrass, nitrate ($NO_3$) leaching, and nitrous oxide ($N_2O$) emission were evaluated from 2010 through 2011. Total N removal significantly increased with N rate despite the fact that yield did not increased with above $56kg\;N\;ha^{-1}$ of N rate. Apparent nitrogen recoveries were 4.81 and 5.48% at 56 and $112kg\;N\;ha^{-1}$ of N rate, respectively. Nitrogen use efficiency decreased into half with increasing N rate from 56 to $112kg\;N\;ha^{-1}$. Nitrate leaching and $N_2O$ emission were related to N use of switchgrass. There was no significant difference of cumulative $NO_3$ leaching between 0 and $56kg\;N\;ha^{-1}$ but, it significantly increased at $112kg\;N\;ha^{-1}$. There was no significant difference of cumulative $N_2O$ emission among N rates in crest, but it significantly increased at $112kg\;N\;ha^{-1}$ in toe. Excessive N application rate (above $56kg\;N\;ha^{-1}$) beyond plant requirement could accelerate $NO_3$ leaching and $N_2O$ emission in switchgrass field. Overall, $56kg\;N\;ha^{-1}$ might be optimum N application rate in reducing economic waste on N fertilizer and adverse environmental impacts.

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References

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