Nitrogen Dynamics in Soil Amended with Different Rate of Nitrogen Fertilizer

Sung Un  Kim; Eun-Jung  Choi; Hyun-Cheol  Jeong; Jong-Sik  Lee; Hyun Ho   Lee; Hye Jin  Park; Chang Oh  Hong

doi:10.7745/KJSSF.2017.50.6.574

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Nitrogen Dynamics in Soil Amended with Different Rate of Nitrogen Fertilizer

December 2017. pp. 574-587

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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 (NO₃) leaching, and nitrous oxide (N₂O) 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 56 kg N ha^-1 of N rate. Apparent nitrogen recoveries were 4.81 and 5.48% at 56 and 112 kg N ha^-1 of N rate, respectively. Nitrogen use efficiency decreased into half with increasing N rate from 56 to 112 kg N ha^-1 . Nitrate leaching and N₂O emission were related to N use of switchgrass. There was no significant difference of cumulative NO₃ leaching between 0 and 56 kg N ha^-1 but, it significantly increased at 112 kg N ha^-1 . There was no significant difference of cumulative N₂O emission among N rates in crest, but it significantly increased at 112 kg N ha^-1 in toe. Excessive N application rate (above 56 kg N ha^-1 ) beyond plant requirement could accelerate NO₃ leaching and N₂O emission in switchgrass field. Overall, 56 kg N ha^-1 might be optimum N application rate in reducing economic waste on N fertilizer and adverse environmental impact

Biomass yield, N concentration, total N removal, fertilizer N removal, apparent N recovery (ANR), and N use efficiency (NUE) affected by N fertilization in 2010 and 2011.

^†Rate mean: mean value across N rates. ^‡Year mean: mean value across years. Upper and lower case letters are for column and row comparison. Values with same letter within a column or row are not significantly different at P<0.05.

Keywords

Bioenergy

Nitrate

Nitrous oxide

Nitrogen use

Switch grass

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Information

Publisher :Korean Society of Soil Science and Fertilizer
Publisher(Ko) :한국토양비료학회
Journal Title :Korean Journal of Soil Science and Fertilizer
Journal Title(Ko) :한국토양비료학회 학회지
Volume : 50
No :6
Pages :574-587
Received Date : 2017-11-07
Revised Date : 2017-11-15
Accepted Date : 2017-11-15
DOI :https://doi.org/10.7745/KJSSF.2017.50.6.574

Korean Journal of Soil Science and Fertilizer ISSN:0367-6315(Print) 2288-2162(Online) 한국토양비료학회 학회지

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