酸化鉄, マンガン(IV), 硫酸根資材添加による湛水土壌のメタン生成抑制

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The oxidation-reduction potential of manganese oxide (Mn^<4+>), amorphous iron (Fe^<3+>) and ammonium sulfate (SO_4^<2->) has been found to be higher than that of methane production. As a result, the substances tend to reduce methane production when applied to paddy fields. 1)With the addition of rice straw(RS)0.0% and 0.1% the effect of each material was not observed. However, the effect of the substances, especially Mn^<4+> and Fe^<3+> were observed with application of RS 0.3% and RS 0.5%. 2)Soil Eh of RS 0.0%, 0.1% and 0.3% applied soil was found to be high. However, that of RS 0.5% was low and ranged between -150 and -200 mV for each of the materials. 3)We added acetic acid and rice root powder as a substrate for methane production. Further, we added Fe^<3+> and SO_4^<2->. The effect of the materials on rice root powder was more noticeable than that of acetic acid. 4)In a pot experiment with RS 0.0%, emission of methane was found to be in the order Fe^<3+>> Mn^<4+>> Fe^<3+>+Mn^<4+>. However, with RS 0.3% no effect was observed. This is because the amount of methane in the RS 0.0% and RS 0.3% soil before drainage of surface water was considerably decreased compared with the untreated soil. 5)As stated above, two factors control methane production. (1)Soil was maintained in an oxidative condition by the addition of the Mn^<4+> Fe^<3+> and SO_4^<2->. (2)Decomposable organic matter was adsorbed to the materials and therefore not available for decomposition.
社団法人日本土壌肥料学会の論文
1996-08-05

酸化鉄, マンガン(IV), 硫酸根資材添加による湛水土壌のメタン生成抑制

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