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김찬섭,유순호,Kim, Chan-Sub,Yoo, Sun-Ho 한국토양비료학회 1991 한국토양비료학회지 Vol.24 No.2
This study examines the effect of submergence on phosphorus adsorption characteristics 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 submergence, the phosphorus adsorption was conducted at three temperatures(5, 25 and $45^{\circ}C$). The phosphorus adsorption maximum($X_m$) and the equilibrium constant(K) were obtained by Langmuir adsorption isotherm, and the heat of adsorption(${\Delta}H$) was calculated by van't Hoff's equiation. Results obtained are as follows ; 1. The amounts of adsorbed P were increased with temperature, but the effects of temperature on rate of P adsorption were very small in all three soils. 2. By submergence, $X_m$ were increased from 500mg P/kg to 850mg P/kg in Gangseo soil, from 1,850mg P/kg to 3,300mg P/kg in Yesan soil, and from 310mg P/kg to 670mg P/kg in Jungdong soil. But the effects of temperature on $X_m$ were very small in all three soils. 3. Submergence decreased K for Gangseo and Yesan soils, but increased for Jungdong soil. Whereas K were increased with temperature in all three soils. 4. By submergence, ${\Delta}H$ for Gangseo soil was greatly increased (from 2.2 Kcal/mole to 3.5 Kcal/mole), whereas that for Yesan soil changed little (from 5.7 Kcal/mole to 5.5 Kcal/mole). It was 4.4 Kcal/mole in submerged Jungdong soil.
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