Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Variation of Phosphorus Concentration and Redox Potential in a Paddy Field Plot During Growing Season

영농기 필지논에서의 인 (P) 농도와 산화환원전위 (Eh)의 변화 특성

  • 김영현 (충북대학교 농업생명환경대학 지역건설공학과) ;
  • 김진수 (충북대학교 농업생명환경대학 지역건설공학과) ;
  • 장훈 (충북대학교 농업생명환경대학 지역건설공학과)
  • Received : 2010.06.30
  • Accepted : 2010.08.23
  • Published : 2010.09.30
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Abstract

The purpose of this study is to investigate characteristics of total phosphorus (TP) and phosphate phosphorous ($PO_4$-P) concentrations in ponded water and redox potential (Eh) in paddy soil during the growing season. The TP and $PO_4$-P concentrations showed twice peak values after basal dressing and tillering fertilization. The ratio of $PO_4$-P to TP showed low values (0.07~0.18), indicating that most of phosphorus is particlulate. The $PO_4$-P concentrations significantly decreased with dissolved oxygen (DO) concentrations. The Eh showed high values (179~636 mV) under non-ponded aerobic condition, but low values (74~112 mV) under ponded anaerobic condition The TP and $PO_4$-P concentrations in ponded water increased shortly after tillering fertilization even if phosphorus was not applied. This may be due to the release of dissolved phosphorus from the bottom sediment and its associated algal and water flea blooms under anaerobic condition. Therefore, proper water management should be needed shortly after tillering fertilization.

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References

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