Effects of the Addition of Fe(0) on the Reduction of Fe(III) in Submerged Rice Soil
スポンサーリンク
概要
- 論文の詳細を見る
The present study aimed at determining firstly whether Fe(0) is oxidized to Fe(II) in submerged rice soil, what is the acceptor of electrons released from Fe(0), and finally how the Eh values changed in the presence of Fe(0). Under laboratory conditions, flooded soil with the addition of Fe(0) was incubated anaerobically. Although the addition of Fe(0) may increase the amount of Fe(II), it is difficult to determine whether Fe(II) is derived from Fe(III) or Fe(0). For the current experiments, therefore, P-poor soil with the addition of ferric phosphate (Fe(III)PO_4) and P-rich soil were used. If the electrons from Fe(0) flows to Fe(III)PO_4. and/or the complex of Fe(III) oxides and phosphate in soil, Fe(III) should be reduced to soluble Fe(II). This reduction increases the Bray-P content because of the production of Fe(II)_3(PO_4)_2 that is more soluble than Fe(III)PO_4. When P-poor soil with the addition of Fe(III)PO_4. and Fe(0) was incubated, the amounts of both Fe(II) and P in soil increased. This finding indicates that Fe(0) was oxidized to Fe(II) and, subsequently, that the electrons released from Fe(0) flowed.to Fe(III)PO_4. When the P-rich soil with Fe(0) was incubated, the amount of Fe(II) increased, unlike the amount of P. These findings show that Fe(0) was oxidized to Fe(II). However, the electrons released from Fe(0) did not flow to the complex of Fe(III) oxides and phosphate in soil. On the basis of these results, it can be concluded that the electrons from Fe(0) flows more easily to Fe(III)PO_4 than to the complex of Fe(III) oxides and phosphate in soil. In the presence of Fe(0) and Fe(III)PO_4,the changes in the Eh values were investigated. If Fe(0) alone contributes to the maintenance of the redox equilibria, then the Eh values should increase with the change of Fe(0) it Fe(II) because Fe(0) and Fe(II) are the reduced and oxidized forms, respectively. In the current study, however, the addition of Fe(0) did not increase the Eh values. The presence of Fe(0) decreased the Eh values and increased the pH and Fe(II) content during the incubation. These findings suggest that Fe(0) and Fe(III) oxides in soil contribute to the maintenance of the redox equilibria in soil.
- 社団法人日本土壌肥料学会の論文
著者
-
Nozoe T
Laboratory Of Macro-components National Institute Of Agro-environmental Sciences:(present Address)in
-
Nozoe Takuhito
International Rice Research Institute
-
Nozoe Takuhito
Laboratory of Macro-Components, National Institute of Agro-Environmental Sciences
-
Sekiguchi Tetsuo
Laboratory of Macro-Components, National Institute of Agro-Environmental Sciences
-
Inoue Tsunehisa
Laboratory of Macro-Components, National Institute of Agro-Environmental Sciences
-
Sekiguchi Tetsuo
Laboratory Of Macro-components National Institute Of Agro-environmental Sciences
-
Inoue Tsunehisa
Water Quality And Solute Dynamics Group Department Of Environmental Chemistry
関連論文
- Iron (Fe) tolerance of elite breeding lines developed at IRRI in relation to Fe-excluding power of rice roots
- Root-Shoot Interaction as a Limiting Factor of Biomass Productivity in New Tropical Rice Lines(Plant Nutrition)
- 11-8 Root activity and biomass productivity of new type of tropical rice plant
- 45 Relationship among soil managements, pH of soil and growth of paddy rice in tropical area
- 16-13 Effect of Soil Drying on the Changes in Soil pH in Tropical Area : Difference in Wet and Dry Season
- 11-19 Relationships between stem sap exudation and other root characteristics in new plant type of tropical rice
- Effects of the Addition of Fe(0) on the Reduction of Fe(III) in Submerged Rice Soil
- Effects of the Addition of Fe-Containing Slag Fertilizers on the Changes in Eh in Paddy Soil
- Estimation of Cadmium Load on Japanese Farmland Associated with the Application of Chemical Fertilizers and Livestock Excreta(Environment)
- Trends of Phosphate Fertilizer Demand and Phosphate Balance in Farmland Soils in Japan (Environment)