Agriculture 1 Alginate-cellulose nanofiber-poly(vinyl alcohol) hydrogel 1 Alginates 1 Article 1 Crystallization 1 Delayed-Action Preparations 1 Drug Liberation 1 Fertilizers 1 Humans 1 Hydrogen-Ion Concentration 1 Kinetics 1 Nanofibers 1 Nitrogen 1 Phosphorus 1 Polyvinyl Alcohol 1 Porosity 1 Potassium 1 Slow-release of chemicals 1 Swelling kinetics Water 1 agriculture 1 alginic acid 1 alkali 1 cellulose nanofiber 1 chemical structure 1 chemistry 1 cross linking 1 crystal structure 1 crystallization 1 deionized water 1