Soil degrading due to mining activities often requires improvement to support optimal plant growth. In this study, a soil ameliorant formulation enriched was applied to former sand mining areas. The soil ameliorant comprised a combination of water hyacinth compost, humic acid, and straw biochar. The research consisted of 7 treatments, including 1 control treatment, 1 treatment using N, P, K, and S fertilizers recommendation, 1 treatment using only the soil ameliorant, and 4 treatments combining the soil ameliorant with N, P, K, and S fertilizers. The results indicated that the combination of soil ameliorant significantly influenced the growth of shallot plants and the fresh bulb weight per plant. Overall, the combination of 1 dose of soil ameliorant (water hyacinth compost 25 tons/ha, humic acid 40 kg/ha, straw biochar 20 tons/ha) combined with ¾ dose of N, P, K, and S fertilizers showed the best results in terms of shallot fresh bulb weight per plant. This proves that adding organic soil ameliorant can enhance nutrient availability in former sand mining soil.