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. https://doi.org/10.65422/loujas.v2i1.306.