Nitrogen Dynamics in Soil Amended with Different Rate of Nitrogen Fertilizer

다국어 초록 (Multilingual Abstract)

Excessive application of nitrogen (N) fertilizer to support switchgrass growth for bioenergy production maycause adverse environmental effects. The objective of this study was to determine optimum N application rateto 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 (NO3) leaching, andnitrous oxide (N2O) emission were evaluated from 2010 through 2011. Total N removal significantlyincreased with N rate despite the fact that yield did not increased with above 56 kg N ha-1 of N rate. Apparentnitrogen recoveries were 4.81 and 5.48% at 56 and 112 kg N ha-1 of N rate, respectively. Nitrogen useefficiency decreased into half with increasing N rate from 56 to 112 kg N ha-1. Nitrate leaching and N2Oemission were related to N use of switchgrass. There was no significant difference of cumulative NO3leaching between 0 and 56 kg N ha-1 but, it significantly increased at 112 kg N ha-1. There was no significantdifference of cumulative N2O emission among N rates in crest, but it significantly increased at 112 kg N ha-1 intoe. Excessive N application rate (above 56 kg N ha-1) beyond plant requirement could accelerate NO3leaching and N2O emission in switchgrass field. Overall, 56 kg N ha-1 might be optimum N application rate inreducing economic waste on N fertilizer and adverse environmental impacts.

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