The Effect of Submergence on Phosphorus Adsorption Characteristics in Soils II. Phosphorus Adsorption and Fractions of Inorganic Phosphorus

담수처리(湛水處理)가 토양(土壤)의 인산(燐酸) 흡착(吸着) 특성(特性)에 미치는 영향(影響) II. 인산흡착(燐酸吸着)과 무기태(無機態) 인산(燐酸) 분획(分劃)

  • Kim, Chan-Sub (Agricultural Chemicals Research Institute) ;
  • Yoo, Sun-Ho (College of Agriculture, Seoul National University)
  • Published : 1991.12.30

Abstract

This study examines the effect of submergence on transformations of inorganic phosphorus and the relation between fractions of inorganic phosphorus and adsorbed phosphorus in Gangseo (paddy soil), Yesan (non-cultivated soil), and Jungdong soil (upland soil). The soils were submerged with glucose sol'n at $28^{\circ}C$ for 17 days. After, the soils were incubated with phosphate solution at $25^{\circ}C$ for 24 hours. The seguential fractionation of inorganic phosphorus and of iron were conducted to investigate transformations of them. Results obtained are as follows; 1. By submergence, Bray I-P were decreased from 53mgP/kg to 48mgP/kg in Gangseo, from 3mgP/kg to 1mgP/kg in Yesan, and from 120mgP/kg to 56mgP/kg in Jungdong soil. 2. $NH_4F$ extractable P was dominant fraction of adsorbed P. It was transformed into NaOH extractable P by submergence in Jungdong soil. 3. Dithionite-citrate-bicarbonate extractable iron (crystalline Fe) was transformed to oxalate extractable iron (amorphous Fe) by submergence in Yesan soil.

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