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Effects of Fe fertilizer eluate on the growth of Sargassum horneri at the germling and immature stages

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Abstract

To aid in the restoration of coastal barren ground areas, it is important to clarify the effects of chelated iron on the growth of seaweed. In particular, for the further development of practical methods to promote seaweed growth, Fe-binding organic ligands, such as humic substances (HSs) composed of humus materials, rather than Fe-binding inorganic ligands, such as ethylenediaminetetraacetic acid (EDTA), should be investigated. In this study, the effects of an Fe fertilizer, made from HSs and steelmaking slag, on the growth of the brown alga Sargassum horneri at the germling and immature stages were examined. The addition of the Fe fertilizer eluate containing Fe organic ligand complexes clearly promoted the growth of S. horneri at the germling and immature stages. It was also clear that the effect of Fe concentration in the Fe fertilizer eluate on the growth rate was almost the same as that of Fe–EDTA. Moreover, the addition of the Fe fertilizer eluate had a great effect on the brown color of S. horneri thalli and promoted the increased content of photosynthetic pigments, such as chlorophyll a. Based on these experimental results, the application of the Fe fertilizer containing Fe organic ligand complexes is expected to become an effective method for the restoration of the barren ground phenomenon in Fe-deficient coastal areas.

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Acknowledgments

This research was supported by Kanazawa University and Nippon Steel & Sumitomo Metal Corporation.

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Authors and Affiliations

  1. Institute of Science & Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa Prefecture, 920-1192, Japan

    Osamu Miki, Taichi Nagai, Mawardi Marzuki & Chikako Okumura

  2. Advanced Technology Research Laboratories, Nippon Steel & Sumitomo Metal Corporation, 20-1, Shintomi, Futtsu, Chiba Prefecture, 293-8511, Japan

    Chika Kosugi & Toshiaki Kato

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  1. Osamu Miki
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  2. Taichi Nagai
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  3. Mawardi Marzuki
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  4. Chikako Okumura
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  5. Chika Kosugi
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  6. Toshiaki Kato
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Correspondence to Osamu Miki.

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Miki, O., Nagai, T., Marzuki, M. et al. Effects of Fe fertilizer eluate on the growth of Sargassum horneri at the germling and immature stages. J Appl Phycol 28, 1775–1782 (2016). https://doi.org/10.1007/s10811-015-0729-8

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  • DOI: https://doi.org/10.1007/s10811-015-0729-8

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