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Comparing Farming Methods in Pollutant runoff loads from Paddy Fields using the CREAMS-PADDY Model

영농방법에 따른 논에서의 배출부하량 모의

  • Song, Jung-Hun (Department of Landscape Architecture and Rural systems Engineering, Seoul National University) ;
  • Kang, Moon-Seong (Department of Landscape Architecture and Rural systems Engineering, Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Song, In-Hong (Research Institute for Agriculture and Life Sciences, College of Agriculture & Life Sciences, Seoul National University) ;
  • Jang, Jeong-Ryeol (Rural Research Institute, Korea Rural Community Corporation)
  • 송정헌 (서울대학교 생태조경.지역시스템공학부) ;
  • 강문성 (서울대학교 조경.지역시스템공학부, 농업생명과학연구원) ;
  • 송인홍 (서울대학교 농업생명과학연구원) ;
  • 장정렬 (한국농어촌공사 농어촌연구원)
  • Received : 2012.10.16
  • Accepted : 2012.11.17
  • Published : 2012.12.31

Abstract

BACKGROUND: For Non-Point Source(NPS) loads reduction, pollutant loads need to be quantified for major farming methods. The objective of this study was to evaluate impacts of farming methods on NPS pollutant loads from a paddy rice field during the growing season. METHODS AND RESULTS: The height of drainage outlet, amount of fertilizer, irrigation water quality were considered as farming factors for scenarios development. The control was derived from conventional farming methods and four different scenarios were developed based combination of farming factors. A field scale model, CREAMS-PADDY(Chemicals, Runoff, and Erosion from Agricultural Management Systems for PADDY), was used to calculate pollutant nutrient loads. The data collected from an experimental plot located downstream of the Idong reservoir were used for model calibration and validation. The simulation results agreed well with observed values during the calibration and validation periods. The calibrated model was used to evaluate farming scenarios in terms of NPS loads. Pollutant loads for T-N, T-P were reduced by 5~62%, 8~37% with increasing the height of drainage outlet from 100 mm of 100 mm, respectively. When amount of fertilizer was changed from standard to conventional, T-N, T-P pollutant loads were reduced by 0~22%, 0~24%. Irrigation water quality below water criteria IV of reservoir increased T-N of 9~65%, T-P of 9~47% in comparison with conventional. CONCLUSION(S): The results indicated that applying increased the height of drainage after midsummer drainage, standard fertilization level during non-rainy seasons, irrigation water quality below water criteria IV of reservoir were effective farming methods to reduce NPS pollutant loads from paddy in Korea.

Keywords

CREAMS-PADDY;Farming method;Paddy;Pollutant loads;Water quality

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