Scholarlink

<p>Controlled-release fertilizers improve nitrogen use efficiency (NUE), but the development of sustainable diffusion-controlling matrix materials remains a significant challenge. This study investigates the mechanistic role of a sub-bituminous coal matrix as an engineered diffusion-controlling system for regulating nitrogen release kinetics. Sub-bituminous coal was pulverized and incorporated with urea at different mixing ratios to produce composite fertilizer matrices. Material characterization, soil incubation, nitrogen leaching, ammonia volatilization, and greenhouse experiments were conducted, while nitrogen release behavior was analyzed using the First-order, Higuchi, and Korsmeyer–Peppas kinetic models. Increasing coal content progressively reduced nitrogen release rate constants and prolonged nutrient release by enhancing diffusion resistance and adsorption within the porous matrix. The C75 formulation achieved the highest nitrogen use efficiency (73.6%), compared with 41.2% for conventional urea, while exhibiting substantially lower nitrogen losses through leaching and volatilization. These results demonstrate that the sub-bituminous coal-derived porous matrix functions as an engineered controlled-release system and provides a sustainable pathway for the value-added utilization of low-rank coal resources.</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

Sub-bituminous coal as an engineered diffusion-controlling matrix for regulating nitrogen release kinetics and enhancing fertilizer efficiency

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月20日

查看全文
  • Edy Nursanto,
  • Chairul Salam M,
  • Shofa Rijalul Haq

摘要

Controlled-release fertilizers improve nitrogen use efficiency (NUE), but the development of sustainable diffusion-controlling matrix materials remains a significant challenge. This study investigates the mechanistic role of a sub-bituminous coal matrix as an engineered diffusion-controlling system for regulating nitrogen release kinetics. Sub-bituminous coal was pulverized and incorporated with urea at different mixing ratios to produce composite fertilizer matrices. Material characterization, soil incubation, nitrogen leaching, ammonia volatilization, and greenhouse experiments were conducted, while nitrogen release behavior was analyzed using the First-order, Higuchi, and Korsmeyer–Peppas kinetic models. Increasing coal content progressively reduced nitrogen release rate constants and prolonged nutrient release by enhancing diffusion resistance and adsorption within the porous matrix. The C75 formulation achieved the highest nitrogen use efficiency (73.6%), compared with 41.2% for conventional urea, while exhibiting substantially lower nitrogen losses through leaching and volatilization. These results demonstrate that the sub-bituminous coal-derived porous matrix functions as an engineered controlled-release system and provides a sustainable pathway for the value-added utilization of low-rank coal resources.