Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Effects of Fertilizer Types on Pollutant Loadings from Rice Paddy Fields

비종에 따른 논에서의 배출부하량 영향평가

  • 장승우 (서울대학교 농업생명과학대학 생태조경.지역시스템공학부) ;
  • 강문성 (서울대학교 농업생명과학대학 조경.지역시스템공학부, 농업생명과학연구원) ;
  • 송인홍 (서울대학교 농업생명과학연구원) ;
  • 장정렬 (농어촌공사 농어촌연구원 새만금연구부) ;
  • 이은정 (국립환경과학원) ;
  • 박승우 (서울대학교 농업생명과학대학 조경.지역시스템공학부, 농업생명과학연구원)
  • Received : 2011.10.14
  • Accepted : 2011.11.07
  • Published : 2011.11.30
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Abstract

The main objective of this study was to evaluate the effects of control-release fertilizer (CRF) on pollutant loadings from a small watershed. The Baran watershed, 386 ha in size, was selected as the study site, and the AGNPS (Agricultural Non-point Source Pollution) model was used to evaluate the effects of fertilizer types. Digital maps of digital elevation (DEM), slope distribution, channel, flow direction, landuse, soil, and curve number were extracted from the study watershed. Model parameters related to hydrology and water quality were calibrated and validated by comparing model predictions with the observed data collected for 2 years (1999 to 2000). Calibration and validation resulted in $R^2$ values of 0.75-0.91 for all the water quality parameters. All the paddy fields (21.2 %) of the study watershed were sprayed by either CRF or NPK (standard fertilizer). In CRF application, total nitrogen (TN) load was 4.9% less than NPK application, however total phosphorus (TP) load was 0.7 % more than NPK application. In CRF application, considering only paddy fields in the study area, TN load was 38.7 % less than NPK application. Using CRF in paddy fields could be one of the ways to reduce pollutant loadings from agricultural watersheds, however, in order to confirm it, more researches about effects of using CRF are necessary.

Keywords

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