Journal article Hydrogel beads as slow-release NH 4 + fertilizer and reducing S and Fe in soil acidity: alginate-poly(acrylic acid)-carboxymethyl cellulose-oleic acid
Endar Hidayat (author) (Search by this author)
;
Nur Ain Hannani Hamid (author) (Search by this author)
;
Nur Maisarah Mohamad Sarbani (author) (Search by this author)
;
Muhammad Aslam Mohd Safari (author) (Search by this author)
;
Mitsuru Aoyagi (author) (Search by this author)
;
Hiroyuki Harada (author) (Search by this author)
; ORCID SAMURAI
Hydrogel beads as slow-release NH4 fertilizer and reducing S and Fe in soil acidity alginate-poly acrylic acid -carboxymethyl cellulose-oleic acid_2.pdf
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Endar Hidayat, Nur Ain Hannani Hamid, Nur Maisarah Mohamad Sarbani, Muhammad Aslam Mohd Safari, Mitsuru Aoyagi, Hiroyuki Harada, Sadaki Samitsu. Hydrogel beads as slow-release NH 4 + fertilizer and reducing S and Fe in soil acidity: alginate-poly(acrylic acid)-carboxymethyl cellulose-oleic acid. Journal of Macromolecular Science, Part A. 2025, 62 (5), 410-418. https://doi.org/10.1080/10601325.2025.2479002

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(abstract)

A study was conducted on slow-release NH4+ fertilizer (SRNH4F) embedded in a hydrogel bead matrix consisted of sodium alginate, poly(acrylic acid), and carboxymethyl cellulose, both without (SPC-A) and with (SPC-B) the incorporation of oleic acid. The results demonstrated that SPC-B exhibited higher specific surface area, pore volume and a greater abundance of COOH functional groups. Swelling behavior analysis indicated that all samples achieved their highest swelling in NaOH solution. The SRNH4F release studies revealed that the inclusion of oleic acid significantly reduced NH4+ release, enabling more controlled NH4+ ion delivery in water, while also contributing to reduced CO2 emissions from soil, consistent with the observed trends in soil organic carbon levels. Furthermore, the treatment with hydrogel beads resulted in a significant increase (p ≤ 0.05) in soil available phosphorus, soil cation exchange capacity, exchangeable calcium, and available ammonium nitrogen. The immobilization rates in soil were satisfactory, reaching up to 93.36% for sulfur and 88.33% for iron with SPC-B. This technique demonstrated multifunctionality in improving nutrient management and mitigating environmental pollution.

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Keyword: Hydrogel beads, sulfur and iron contamination, immobilization, oleic acid, slow release fertilizer

Date published: 2025-05-04

Publisher: Informa UK Limited

Journal:

  • Journal of Macromolecular Science, Part A (ISSN: 10601325) vol. 62 issue. 5 p. 410-418

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5986

First published URL: https://doi.org/10.1080/10601325.2025.2479002

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Updated at: 2025-12-10 13:29:08 +0900

Published on MDR: 2026-03-23 12:27:13 +0900

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