Scholarlink

<p>Improving nutrient use efficiency while reducing environmental losses is a critical challenge for sustainable agriculture. Conventional fertilizers such as urea and muriate of potash (MOP) dissolve rapidly, resulting in low nitrogen and potassium retention in soils and significant volatilization losses. To address these limitations, this study developed and evaluated a citric acid cross-linked lignosulfonate biopolymer fertilizer as a controlled-release alternative. The formulation was structurally characterized using FTIR, FE-SEM, EDS, and BET analyses, which confirmed ester-linked cross-linking, mesoporosity, and uniform nutrient embedding. Soil incubation experiments conducted in contrasting textures—sandy loam and clay loam—demonstrated sustained nitrogen and potassium release over 45&#xa0;days, with final release values of 92.5% and 97.2% for nitrogen, and 89.6% and 91.7% for potassium, respectively. In contrast, conventional urea and MOP released over 89% of nutrients within 15&#xa0;days. Kinetic modelling indicated diffusion- and chemisorption-driven release mechanisms, while volatilization assays showed that the biopolymer reduced cumulative ammonia losses by up to one-third relative to urea. These findings demonstrate that lignosulfonate–citric acid cross-linked matrices can synchronize nutrient delivery with soil processes across diverse textures, thereby enhancing nutrient use efficiency and lowering environmental impacts. The study highlights the practical potential of renewable polymer-based fertilizers as scalable, eco-friendly solutions, with field-scale validation identified as the next critical step.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Comparative analysis of nutrient release dynamics from a citric acid cross-linked lignosulfonate biopolymer fertilizer and conventional sources under varied soil textures

  • 期刊论文

  • 发表日期：

    2026年5月6日

查看全文
  • Meena Mahalingam,
  • Jegadeeswari Dheebakaran,
  • Sathiya Bama Kaliappan,
  • Boomiraj Kovilpillai,
  • Senthil Alagarswamy,
  • Rajeswari Ramanathan

摘要

Improving nutrient use efficiency while reducing environmental losses is a critical challenge for sustainable agriculture. Conventional fertilizers such as urea and muriate of potash (MOP) dissolve rapidly, resulting in low nitrogen and potassium retention in soils and significant volatilization losses. To address these limitations, this study developed and evaluated a citric acid cross-linked lignosulfonate biopolymer fertilizer as a controlled-release alternative. The formulation was structurally characterized using FTIR, FE-SEM, EDS, and BET analyses, which confirmed ester-linked cross-linking, mesoporosity, and uniform nutrient embedding. Soil incubation experiments conducted in contrasting textures—sandy loam and clay loam—demonstrated sustained nitrogen and potassium release over 45 days, with final release values of 92.5% and 97.2% for nitrogen, and 89.6% and 91.7% for potassium, respectively. In contrast, conventional urea and MOP released over 89% of nutrients within 15 days. Kinetic modelling indicated diffusion- and chemisorption-driven release mechanisms, while volatilization assays showed that the biopolymer reduced cumulative ammonia losses by up to one-third relative to urea. These findings demonstrate that lignosulfonate–citric acid cross-linked matrices can synchronize nutrient delivery with soil processes across diverse textures, thereby enhancing nutrient use efficiency and lowering environmental impacts. The study highlights the practical potential of renewable polymer-based fertilizers as scalable, eco-friendly solutions, with field-scale validation identified as the next critical step.

Graphical abstract