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Evaluation of Bioavailability of Phosphorus Accumulated in Arable Soils

농경지 토양에 집적된 인산의 생물이용가능성 평가

  • Lee, Seul-Bi (National Academy of Agricultural Science, RDA) ;
  • Lee, Chang-Hoon (National Academy of Agricultural Science, RDA) ;
  • Kim, Gun-Yeob (National Academy of Agricultural Science, RDA) ;
  • Lee, Jong-Sik (National Academy of Agricultural Science, RDA) ;
  • So, Kyu-Ho (National Academy of Agricultural Science, RDA) ;
  • Kim, Sang-Yoon (Division of Applied Life Science (BK 21 Program), Gyeongsang National University) ;
  • Kim, Pil-Joo (Division of Applied Life Science (BK 21 Program), Gyeongsang National University)
  • 이슬비 (농촌진흥청 국립농업과학원) ;
  • 이창훈 (농촌진흥청 국립농업과학원) ;
  • 김건엽 (농촌진흥청 국립농업과학원) ;
  • 이종식 (농촌진흥청 국립농업과학원) ;
  • 소규호 (농촌진흥청 국립농업과학원) ;
  • 김상윤 (경상대학교 응용생명과학부) ;
  • 김필주 (경상대학교 응용생명과학부)
  • Received : 2012.10.23
  • Accepted : 2012.11.23
  • Published : 2012.12.31

Abstract

BACKGROUND: Soil utilization pattern can be the main factor affecting soil physico-chemical properties, especially in soil phosphorus (P). Understanding the distribution and bioavailability of P is important for developing management to minimize P release from arable soils to environment. This study was conducted to evaluate the potential bioavailability of soil organic P by using phosphatase hydrolysis method. METHODS AND RESULTS: Twenty-four soils from onion-rice double cropping and 30 soils from plastic film house were selected from Changyeong and Daegok in Gyeongnam province, respectively. The P accumulation pattern (total P, inorganic P, organic P, residual P) and water soluble P were characterized. Commercial phosphatase enzymes were used to classify water-extractable molybdate unreactive P from arable soils into compounds that could be hydrolysed by (i) alkaline phosphomonoesterase (comprising labile orthophosphate monoesters), (ii) a combination of alkaline phosphomonoesterase and phosphodiesterase (comprising labile orthophosphate monoesters and diesters), and (iii) phytase (including inositol hexakisphosphate). Available P was highly accumulated with 616 and 1,208 mg/kg in double cropping system and plastic film house, respectively. Dissolved reactive P (DRP) and dissolved unreactive P (DUP) had similar trends with available P, showing 24 and 109 mg/kg in double cropping and 37 and 159 mg/kg in plastic film house, respectively, indicating that important role of dissolved organic P in the environments had been underestimated. From the result of phosphatase hydrolysis, about 39% and 66% of DUP was evaluated as bioavailable in double cropping and plastic film house, respectively. CONCLUSION(S): Orthophosphate monoester and orthophosphate diester accounted for high portion of dissolved organic P in arable soils, indicating that these organic P forms give important impacts on bioavailability of P released from P accumulated soils.

Keywords

Bioavailability;Phosphatase hydrolysis;Soil phosphorus

Acknowledgement

Supported by : Rural Development Administration

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