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Articles | Volume 12, issue 1
Articles | Volume 12, issue 1
https://doi.org/10.5194/soil-12-279-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/soil-12-279-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 12, issue 1
Original research article
 | 
26 Mar 2026
Original research article |  | 26 Mar 2026

Leaching behavior of steelmaking slag fertilizer under repeated wetting and drying conditions simulating upland soil

Takayuki Iwama, Shohei Koizumi, Megumi Obara, and Shigeru Ueda

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Short summary
Acidic soils can lock up nutrients and release harmful metals, reducing crop growth. In a laboratory soil-column experiment, we tested steelmaking slag, an alkaline by-product, under repeated wetting and drying. The slag-mixed layer showed lasting improvement in acidity for twenty-four weeks, while nearby layers changed little. Slag released calcium slowly and formed surface coatings, suggesting durable, place-specific treatment and guidance for rate, depth, and reapplication.
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