Significance of Hydrous Iron Oxides in Enhancing P Sorption of Soils with the Addition of Sodium Hydrosulfite (Na_2S_2O_4)(Soil Chemistry and Mineralogy)

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Phosphorus sorption (P_<sor>) of soils is affected by redox conditions. It has been shown that P_<sor> of lowland soils at a pH value of about 4.3 increases when a small amount of sodium hydrosulfite (Na_2S_2O_4) is added and decreases when an excess amount of Na_2S_2O_2 is added to the mixture of a soil and P solution. Hydrous Fe-Al oxides, manganese dioxide (MnO_2), exchangeable Ca, models of reactive components with P in soils, were examined to identify the factors responsible for the increase of P_<sor> in lowland soils when a small amount of Na_2S_2O_4 was added. For clarifying the contribution of the hydrous Fe-Al oxides, goethite and 7 hydrous Fe-Al oxides (Fe/Al atomic ratio : 1/0, 5/1, 2/1, 1/1, 1/2, 1/5, and 0/1) were used. The P_<sor> of all these materials increased when they were treated with a small amount of Na_2S_2O_4, although the increase was the smallest for the hydrous Al oxide among the 7 oxides. Thus, the hydrous Fe oxides, and Al oxide to a smaller extent, play an important role in the increase in P_<sor> of the lowland soils treated with a small amount of Na_2S_2O_4 The P_<sor> of the hydrous Fe oxides was not appreciably affected by the addition of MnO_2. The increase in P_<sor> of the Ca-saturated Hachirogata soil was almost the same as that of the Nasaturated Hachirogata soil, indicating that exchangeable Ca did not affect appreciably the increase of P_<sor> in reduced soils at a pH value of about 4.3.
社団法人日本土壌肥料学会の論文

Significance of Hydrous Iron Oxides in Enhancing P Sorption of Soils with the Addition of Sodium Hydrosulfite (Na_2S_2O_4)(Soil Chemistry and Mineralogy)

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