Synergistic Effects of Coconut Husk Biochar and Palm Fiber on Soil Nitrogen and Phosphorus Dynamics and Pak Choi (Brassica rapa,subsp. chinensis) Nutrient Uptake . Libyan Open Univ J Appl Sci. 2026;2(1):520-529. doi:10.65422/loujas.v2i1.306