ArticleScientific reports2025
Efficient release of urea with amorphous silica from pumice rock.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Urea is a nitrogenous fertilizer usually applied for optimum production; nevertheless, nearly 50% is lost before utilization, resulting in poor yields and severe environmental pollution. As a result, controlled-release urea fertilizers are emerging to reduce nitrogen loss from highly soluble traditional urea fertilizers. Most controlled-release urea coatings emanate from costly or non-biodegradable polymers, which present ecological hazards. This study explored the feasibility of silica derived from pumice rock as a coating material for controlled-release urea. Silica was successfully extracted from pumice rock via alkaline leaching and characterized as amorphous with a high purity of 96.32%. Release studies showed that silica-coated urea significantly prolonged nutrient release, delivering 78% of urea over 5 days, compared to uncoated urea, which released the same amount within 24 h. These findings demonstrate that silica derived from pumice can serve as an effective, biodegradable coating material, offering a promising alternative to costly and environmentally harmful polymer-based coatings.
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