Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Nutrient Balance in the Paddy Fields Watershed with a Source of River Water

하천관개지역 광역논에서의 영양물질의 물질수지

  • Lee, Jeong Beom (Dept. of Agricultural and Rural Engineering, Chungbuk National University) ;
  • Lee, Jae Yong (Dept. of Agricultural and Rural Engineering, Chungbuk National University) ;
  • Li, Si Hong (Dept. of Agricultural and Rural Engineering, Chungbuk National University) ;
  • Jang, Jeong Ryeol (Rural Research Institute, Korea Rural Community Cooperation) ;
  • Jang, Ik Geun (Hwaan Project Office, Korea Rural Community Cooperation) ;
  • Kim, Jin Soo (Dept. of Agricultural and Rural Engineering, Chungbuk National University)
  • Received : 2014.07.15
  • Accepted : 2014.08.13
  • Published : 2014.09.30
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Abstract

The objective of this research was to investigate concentration and load of nutrients such as total nitrogen (TN), nitrate nitrogen ($NO_3$-N) total phosphorous (TP), and phosphate phosphorous ($PO_4$-P) in a 23.4-ha paddy fields watershed with river water source. Water samples for irrigation water, drainage water, ponded water and groundwater were collected, and irrigation and drainage water were measured at 5~10 day intervals during normal days and at 2~6 hours intervals during three storm events. The amount of irrigation water in the study area was over 2,000 mm, which is almost identical to that in the area irrigated from a large reservoir but much more than that in the area irrigated from a pumping station. Mean flow-weighted concentrations of TN and TP in irrigation water were 2.8 and 0.15 mg/L, respectively, higher than those in the area irrigated from a large reservoir or a pumping station. The ratios of irrigation load to total inflow load for TN and TP were 88 %, and the ratios of surface outflow load to total outflow load for TN and TP were over 90 %, indicating that total nutrient load may be greatly affected by water management. The nutrient loads per area in the study area were estimated as TN 21.1 kg/ha and TP 1.1 kg/ha. Especially, the TP load per area in the study area was smaller than that in the area irrigated from a large reservoir or a pumping station. This may be because outflow load is not high likely due to sedimentation of particulate P and irrigation water load is high due to high TP concentration in irrigation water and high amount of irrigation water.

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References

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