“Synergistic Effects of Coconut Husk Biochar and Palm Fiber on Soil Nitrogen and Phosphorus Dynamics and Pak Choi (Brassica rapa,subsp. chinensis) Nutrient Uptake ” (2026) Libyan Open University Journal of Applied Sciences (LOUJAS), 2(1), pp. 520–529. doi:10.65422/loujas.v2i1.306.