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Change in Available Phosphate by Application of Phosphate Fertilizer in Long-term Fertilization Experiment for Paddy Soil

인산질비료 장기연용 논토양에서 유효인산 변동

  • Kim, Myung-Sook (Soil & Fertilizer Management Division, Department of Agricultural Environment, National Institute of Agricultural Science, Rural Development Administration) ;
  • Kim, Seok-Cheol (Soil & Fertilizer Management Division, Department of Agricultural Environment, National Institute of Agricultural Science, Rural Development Administration) ;
  • Yun, Sun-Gang (Soil & Fertilizer Management Division, Department of Agricultural Environment, National Institute of Agricultural Science, Rural Development Administration) ;
  • Park, Seong-Jin (Soil & Fertilizer Management Division, Department of Agricultural Environment, National Institute of Agricultural Science, Rural Development Administration) ;
  • Lee, Chang-Hoon (Soil & Fertilizer Management Division, Department of Agricultural Environment, National Institute of Agricultural Science, Rural Development Administration)
  • 김명숙 (농촌진흥청 국립농업과학원 농업환경부 토양비료과) ;
  • 김석철 (농촌진흥청 국립농업과학원 농업환경부 토양비료과) ;
  • 윤순강 (농촌진흥청 국립농업과학원 농업환경부 토양비료과) ;
  • 박성진 (농촌진흥청 국립농업과학원 농업환경부 토양비료과) ;
  • 이창훈 (농촌진흥청 국립농업과학원 농업환경부 토양비료과)
  • Received : 2017.08.24
  • Accepted : 2017.09.25
  • Published : 2017.09.30

Abstract

BACKGROUND: Phosphorus(P) is a vital factor for rice but excess input of phosphorus fertilizer can cause environmental risk and waste of fertilizer resources. We studied to assess the change of available phosphate, P balance, critical concentration of available phosphate under a rice single system. METHODS AND RESULTS: The changes of available phosphate of paddy soil were examined from long-term fertilization experiment which was started in 1954 at the National Academy of Agricultural Science. The treatments were no phosphate fertilization(No fert., and N), phosphate fertilization(NPK, NPKC, and NPKCLS). The available phosphorus concentrations in treatments without phosphate fertilizer (No fert. and N) were decreased continuously. But, after 47 years, available phosphate content in phosphate fertilizer treatment (NPK, NPKC, and NPKCLS) reached at the highest ($245{\sim}331mg\;kg^{-1}$), showing a tendency to decrease afterward. The mean annual P field balance in these treatments (NPK, NPKC, and NPKCLS) had positive values that varied from 16.6 to $17.5kg\;ha^{-1}year^{-1}$, and ratio of residual P were increased. These showed that phosphate fertilizer in soil were converted into the form of residual phosphorus which was not easily extracted by available phosphate extractant. Also, It was estimated that the critical value of available phosphate for rice cultivation was $120mg\;kg^{-1}$ using Cate-Nelson equation. CONCLUSION: We concluded that no more phosphate fertilizer should be applied in rice single system if soil available phosphate is higher than the critical P value.

Keywords

References

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