Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Effects of Reclaimed Wastewater Irrigation on Paddy Rice Yields and Fertilizer Reduction using the DSSAT Model

하수처리수의 농업용수 재이용에 따른 논벼 수확량 모의

  • 정한석 (서울대학교 농업생명과학대학 지역시스템공학) ;
  • 성충현 (서울대학교 농업생명과학연구원) ;
  • 장태일 ;
  • 정기웅 (서울대학교 농업생명과학연구원) ;
  • 강문성 (서울대학교 농업생명과학대학 조경.지역시스템공학부, 농업생명과학연구원) ;
  • 박승우 (서울대학교 농업생명과학대학 조경.지역시스템공학부, 농업생명과학연구원)
  • Received : 2011.07.04
  • Accepted : 2011.07.21
  • Published : 2011.07.31
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Abstract

The objectives of this study were to assess the rice yields and evaluate fertilizer reduction effect of reclaimed wastewater irrigation in paddy fields using the Decision Support System for Agrotechnology Transfer (DSSAT) v4.5 model. The experimental plots were designed, which was located near the Suwon wastewater treatment plant in Gyeonggi-do, Korea. The rice yield, irrigation amount, irrigation water quality and soil data were monitored and collected between 2006 and 2009. The DSSAT model was calibrated and validated with observed data. The methods that were used to evaluate this model were the root mean square error (RMSE), normalized root mean square error (nRMSE), and index of agreement (d). The values of RMSE, nRMSE, and d ranged from 145 to $789\;kg\;ha^{-1}$, 3.0 to 13.3 %, and 0.90 to 0.95 for the calibration period, respectively and represented from 91 to $538\;kg\;ha^{-1}$, 2.0 to 10.4 %, 0.94 to 0.98 for the validation period, respectively. Overall, this model showed good agreement with observed data of rice yields irrigated with reclaimed wastewater. The fertilizer reduction effect in paddy field of reclaimed wastewater irrigation was assessed about 60 % in 2008 and 40 % in 2009.

Keywords

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