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<p>Coated slow-release fertilizers have good slow-release effects, can be effectively utilized, and are important new types of fertilizers. Compared with single-layer coatings, double-layer coatings have more durable slow-release effects. A double-layer-coated slow-release fertilizer (DCSRF) was prepared with urea as the core, citric acid-modified starch and polyvinyl alcohol as the inner coating, and sodium alginate as the outer coating. Compared with the single-layer coated fertilizer (SCSRF), the DCSRF demonstrated superior slow-release effects, releasing 69.2% of the nutrients within 38 days in water. Additionally, adding 2% DCSRF to soil increased its maximum water-holding capacity by 8%. Pot trials revealed that the DCSRF considerably improved target crop growth, including tiller number, plant height, root depth, and leaf width, outperforming the other methods. The DCSRF, which is made from eco-friendly, low-cost, and widely available materials, exhibits excellent water-retention and slow-release properties, offering a promising theoretical foundation for the development of new fertilizers.</p>

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Preparation of a citric acid-modified starch/sodium alginate double-layer-coated slow-release fertilizer and its slow-release performance

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Hui Li,
  • Haotan Yan,
  • Xunhua Liao,
  • Shuai Zhang,
  • Jiaqi Luo,
  • Zijian Xue,
  • Shiyu Wang,
  • Wen Li,
  • Zhenbin Chen,
  • Qiaoli Lin,
  • Hong Liu

摘要

Coated slow-release fertilizers have good slow-release effects, can be effectively utilized, and are important new types of fertilizers. Compared with single-layer coatings, double-layer coatings have more durable slow-release effects. A double-layer-coated slow-release fertilizer (DCSRF) was prepared with urea as the core, citric acid-modified starch and polyvinyl alcohol as the inner coating, and sodium alginate as the outer coating. Compared with the single-layer coated fertilizer (SCSRF), the DCSRF demonstrated superior slow-release effects, releasing 69.2% of the nutrients within 38 days in water. Additionally, adding 2% DCSRF to soil increased its maximum water-holding capacity by 8%. Pot trials revealed that the DCSRF considerably improved target crop growth, including tiller number, plant height, root depth, and leaf width, outperforming the other methods. The DCSRF, which is made from eco-friendly, low-cost, and widely available materials, exhibits excellent water-retention and slow-release properties, offering a promising theoretical foundation for the development of new fertilizers.