[논문]관개용수 중의 질산 이온이 논토양의 철 환원과 인 용출에 미치는 영향

김병호; 정종배

[국내논문] 관개용수 중의 질산 이온이 논토양의 철 환원과 인 용출에 미치는 영향
Effect of Nitrate in Irrigation Water on Iron Reduction and Phosphate Release in Anoxic Paddy Soil Condition 원문보기

韓國土壤肥料學會誌 = Korean journal of soil science & fertilizer, v.43 no.1, 2010년, pp.68 - 74

초록
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담수상태의 토양이나 습지생태계에서 ${NO_3}^-$는 환원상태의 발달을 지연시키는 완충역할을 할 수 있다. 논토양에서 관개용수를 통하여 공급되는 ${NO_3}^-$가 Fe의 환원과 그에 따른 P의 가용화에 미치는 영향을 조사하였다. 관개용수중의 ${NO_3}^-$ 함량이 5 mg N $L^{-1}$ 수준일 경우 5 cm 깊이 토양에 도달하기 전에 대부분 탈질작용에 의해 제거되었으며, 5 cm 깊이 토양에서 일어나는 Fe의 환원과 P의 용출이 저해되었고 10 cm 깊이 토양의 환원현상에는 영향을 미치지 못하였다. ${NO_3}^-$ 함량이 10 mg N $L^{-1}$ 수준인 관개용수를 공급하였을 경우에는 10 cm 깊이 토양층까지 ${NO_3}^-$가 잔류 유입되었으며, Fe의 환원과 P의 용출을 현저히 억제하는 것으로 나타났다. 이상의 결과를 보면 관개용수를 통하여 ${NO_3}^-$를 포함한 질소가 과도하게 논토양으로 유입되면 질소과다현상을 유발할 뿐만 아니라 P의 가용화를 억제함으로써 인 결핍을 초래할 수도 있을 것이다.

Abstract ▼ AI-Helper

Since ${NO_3}^-$ is amore favorable electron acceptor than Fe, high ${NO_3}^-$ loads function as a redox buffer limiting the reduction of Fe and following release of ${PO_4}^{3-}$ in flooded paddy soil. The effect ${NO_3}^-$ loaded through irrigation water on Fe reduction and ${PO_4}^{3-}$ release in paddy soil was investigated. Pot experiment was conducted where irrigation water containing 5 or 10 mg N $L^{-1}$ of ${NO_3}^-$ was continuously applied at 1 cm $day^{-1}$, and changes of ${NO_3}^-$, $Fe^{2+}$ and ${PO_4}^{3-}$ concentrations in soil solution at 5 and 10 cm depths beneath the soil surface were monitored as a function of time. Irrigation of rice paddy with water containing 5 mg N $L^{-1}$ of ${NO_3}^-$ led to reduced release of $Fe^{2+}$ and prevented solubilization of P at 5 cm depth beneath the soil surface. And application of irrigation water containing 10 mg N $L^{-1}$ of ${NO_3}^-$ could further suppress Fe reduction and solubilization of P through 10 cm depth soil layer beneath the surface. These results suggest that the introduction of high level ${NO_3}^-$ with irrigation water in rice paddy can strongly limit Fe reduction and P solubilization in root zone soil layer in addition to the excessive supply of N to rice plants.

주제어

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제안 방법

Two drain outlets were installed on the bottom of the cylinder. In this experiment, three experimental systems were constructed and used for the irrigation treatments of three different NO₃^- concentrations.
In this study the effect of surface applied NO₃^- with irrigation water on the release of PO₄^3- in root zone soil layer was investigated using a rice paddy model system.

대상 데이터

02 M CaCl₂solution supplied from bottom of the soil column through drain outlets and 5 cm flooding depth above the soil surface was maintained with the drain outlets closed until the redox potential measured at 10 cm soil depth lowered below -200 mV. Irrigation waters containing three levels of NO₃^-(0, 5 and 10 mg N L^-1) were used in the experiment. Irrigation waters were prepared by dissolving a reagent grade KNO₃ in distilled water containing 0.
The flooded rice paddy model consisted of a 10-L plastic cylinder with a sealed bottom, 24 cm long with a diameter of 23 cm (Fig. 2). The prepared soil was packed uniformly to a height of 15 cm from bottom of the cylinder.
The prepared soil was packed uniformly to a height of 15 cm from bottom of the cylinder. Two soil moisture samplers (Eijkelkamp, Giesbeek, The Netherlands) were placed at each depth of 5 and 10 cm beneath the soil surface for soil solution sample collection. A platinum electrode for redox potential measurement was placed at a depth of 10 cm beneath the soil surface.

이론/모형

1 procedures (RDA, 1988). Content of free iron oxides was measured using Na-dithionite-extraction method (Olson and Ellis, 1982). Soil particle size distribution was determined by micro-pipette method (Miller and Miller, 1987).
Soil pH was determined using a pH meter in deionized water with a 1:5 soil/solution ratio. Organic matter was determined by using Walkley and Black procedure (Nelson and Sommers, 1982). Total and available P contents were measured using perchloric acid digestion and Bray No.
Content of free iron oxides was measured using Na-dithionite-extraction method (Olson and Ellis, 1982). Soil particle size distribution was determined by micro-pipette method (Miller and Miller, 1987).

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