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Impact Assessment of Liquid Manure Application on Soil and Shallow Groundwater in Poplar Experimental Site

액비 시비에 따른 포플러시험포 토양수 및 천층지하수 수질 영향 평가

  • Hong, Eun-Mi (Research Institute for Agriculture & Life Sciences, Seoul National University) ;
  • Choi, Jin-Yong (Department of Rural Systems Engineering and Research Institute for Agriculture & Life Sciences, Seoul National University) ;
  • Nam, Won-Ho (National Drought Mitigation Center (NDMC), School of Natural Resources, University of Nebraska-Lincoln) ;
  • Lee, Sang-Hyun (Research Institute for Agriculture & Life Sciences, Seoul National University) ;
  • Yoo, Seung-Hwan (Agricultural and Biological Engineering, Purdue University)
  • Received : 2014.03.21
  • Accepted : 2014.11.26
  • Published : 2015.01.30

Abstract

As livestock manure treatment is becoming a problem, manure application in forest plantation is recommended as an alternative. In this study, to investigate the impact due to liquid manure application in forest plantation, soil, soil water and shallow groundwater quality had been monitored in poplar experimental site where the liquid manure (LM) was applied. Water samples were collected weekly during growing season (April to October) from 2008 to 2011. From the monitoring results, phosphorus concentration in the soil and soil water had no significant difference between LM and control plots. $NO_3$-N concentration of soil water in LM, however, showed higher concentration (13.6 mg/l at 40 cm, 35.1 mg/l at 80 cm) than control plot (1.5 mg/l at 40 cm, 0.5 mg/l at 80 cm). In case of shallow groundwater quality, pH, heavy metal, etc. were satisfied to the national agricultural water quality standard of groundwater and there were no significant difference between upstream and downstream. The $NO_3$-N concentration of shallow groundwater was also not exceeded the national drinking water standard. However, $NO_3$-N concentration in soil water and downstream of shallow groundwater had increased in 2011 when non-composted LM was applied mostly in non-growing season of tree (September). From the results, it is important to control nitrogen source, application time and decomposed or not when LM is applied. In addition, to investigate nitrate source, further long-term monitoring and modelling could be necessary.

Acknowledgement

Supported by : 농촌진흥청

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