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Utilisation of Coal Clinker Ash in Transforming the Carbon Content of Sandy Soil

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  • Agnes Aron Dube

    (The United Graduate School of Agricultural Sciences, Tottori University, 4-101 Koyama-Minami, Tottori 680-8553, Japan)

  • Mutsa Muhambi

    (The United Graduate School of Agricultural Sciences, Tottori University, 4-101 Koyama-Minami, Tottori 680-8553, Japan)

  • Mitsuru Tsubo

    (Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan)

  • Kuniaki Sato

    (Faculty of Life and Environmental Sciences, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan)

  • Eiji Nishihara

    (Faculty of Agriculture, Tottori University, 4-101 Koyama-Minami, Tottori 680-8553, Japan)

Abstract

Soil carbon (C)’s importance in soil quality assessment and C sequestration is increasing. Sandy soils, due to their low C content, have low C sequestration potential and therefore require C enhancement. This study aimed to enhance sandy soils’ C content and sesame ( Sesamum indicum L.) productivity by applying clinker ash (CA). A 3-year experiment with a completely randomised block design was conducted in an improvised field. Four treatments were replicated six times: Control (sandy only), CA1 (3 mm at 25 t ha −1 ), CA2 (5 mm at 25 t ha −1 ), and rice husk biochar as a positive control (14 t ha −1 ). Hairy vetch ( Vicia villosa R.) was the source of plant nutrients incorporated as green manure. C content and fractions were determined from dry soil collected at each harvesting time. There were significant increases in the C content of sandy soil under CA1, with about 129 and 289% change compared to the control in season 1 and season 3, respectively. Also, the C fractions and CN ratio were significantly enhanced by CA1. CA2 improved the yield of sesame by 424 and 64% in season 2 and season 3, respectively. Applying CA to sandy soils improved the C content, increasing C sequestration capabilities, a key climate mitigation strategy.

Suggested Citation

  • Agnes Aron Dube & Mutsa Muhambi & Mitsuru Tsubo & Kuniaki Sato & Eiji Nishihara, 2025. "Utilisation of Coal Clinker Ash in Transforming the Carbon Content of Sandy Soil," Sustainability, MDPI, vol. 17(5), pages 1-16, February.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:5:p:1952-:d:1599130
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    References listed on IDEAS

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    1. Abdulaziz G. Alghamdi & Mosaed A. Majrashi & Hesham M. Ibrahim, 2023. "Improving the Physical Properties and Water Retention of Sandy Soils by the Synergistic Utilization of Natural Clay Deposits and Wheat Straw," Sustainability, MDPI, vol. 16(1), pages 1-21, December.
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