Lignin–Carrageenan Biohydrogel‐Coated Urea Granules for Controlled Nutrient Release in Soil Systems
The low utilization efficiency of conventional fertilizers (≤ 30%) and increasing environmental stressors necessitate advanced materials for sustainable agriculture. Herein, we report a synthetic chemical‐free biodegradable lignin–carrageenan (50:50) bio‐composite hydrogel engineered as a conformal coating for urea...