| 摘要 |
<p>A process for producing a ferryhydrite humus complex which comprises: the mineral-addition/fermentation step of composting a mixture of organic compounds through fermentation while maintaining pH value within a first range and, at the same time, adding an aqueous mineral solution, which comprises an inorganic acid extract of a sedimentary rock soil and contains Fe(OH)3 within the first pH range as described above, to the mixture; and the post-composting mineral-addition step of adding the above-described aqueous mineral solution to the mixture of organic compounds, which has been composted in the above step, while maintaining the pH value within the first range as described above.</p> |
