The cultivation o Agaricus bisporus, widely known as the white button mushroom, constitutes a signicant global agricultural industry due to its nutritional and health benets. This study evaluated alternative casing soil ormulations using recycled materials and sugarcane bagasse to partially replace peat, thereby improving the yield and nutritional quality o A. bisporus. Additionally, the eects o cornmeal (CM) supplementation to the compost were evaluated on various mushroom characteristics. Results indicated that CM supplementation had stronger positive eects than casing soil treatments on rst fush yield, antioxidant enzyme activities, phenolics, DPPH activity, protein content, and N and Mg levels in mushrooms. Among the treatments, the C3 casing soil—composed o 20 % BVB™ substrate, 40 % recycled soil, 25 % resh sugarcane bagasse, 10 % ermented sugarcane bagasse, and 5 % CaCO₃ + perlite—combined with S2 (1000 g m2 CM) supplementation, resulted in the highest mushroom rmness (3.45), representing a 40.8 % increase compared with the control (2.45). It also showed a 23.91 % increase in dry weight relative to the control (6.79 vs. 5.48 %), while maintaining a comparable ber content (10.67 vs. 10.69 % DW). The highest protein content (3.88 % FW) was obtained with the peat substrate at the S3 (1500 g m2 CM) supplementation level, representing a 14.12 % increase compared with the control (3.40 % FW), ollowed by S3C3. In C3 casing soil, mushrooms exhibited comparable DPPH, GPOX, and total phenol contents to those grown in peat (C2) at S2 and S3

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