This study examined the effects of various combinations of solid compost, liquid extract-compost, and inorganic fertilizers on the growth and nutrient uptake of leek (Allium porrum L.). The objective was to identify the most effective nutrient management strategy to enhance crop performance. Solid compost was produced from cattle manure, and liquid extract-compost was prepared through aqueous extraction and aeration. Six treatment groups with different nitrogen (N) applications were designed, including pure organic and integrated organic-inorganic combinations. Results revealed that 3/3N solid compost significantly improved early plant height and leaf yield, while the combination of 2/3N solid compost with 1/3N inorganic fertilizer achieved the highest total biomass and nitrogen-use efficiency (NUE). Treatments with higher liquid compost application exhibited an initial growth suppression of approximately 15% in leaf biomass during the first three weeks due to ammonium toxicity but recovered in subsequent growth stages. Overall, these findings indicate that balanced organic-inorganic fertilization not only maximizes crop performance but also supports more sustainable nutrient management in leek cultivation