Addition of organic and inorganic supplements to the substrate during cultivation is little known to influence the yield of various species of Elm oyster mushroom. Therefore, an experiment with brans, oilcakes and flours as organic supplements in cultivation of Elm oyster mushroom was undertaken in order to find out better and cheaper supplements to increase the yield of Elm oyster mushroom. The gram flour @ 2% took minimum incubation period of 17.00 days. Further karanj cake @ 2% and maize flour @ 2% recorded 18 days to complete spawn run and, while the soybean flour @ 2% took maximum period (21 days) for spawn run. The number of days required for pinhead formation differed significantly and varied between 20.33 to 28.00 days. Similarly, the days required for the first, second and third harvest ranged from 27 to 60.33 days for the total three harvesting. The minimum days of 27.33, 41 and 56.67 were required for first, second and third harvest, respectively after pinhead formation by the treatment of maize flour @ 2% whereas maximum number of days were required by treatment soybean flour @ 2% for first and second harvest (34.33 and 50 days) which failed for third harvest. The number of fruiting bodiesper beds varied from 6.11 to 89.56 due to different treatments.The neem cake @ 2%produced significantly higher number of fruiting bodies per bed (89.56) while the minimum numbers of fruiting bodies were found in the treatment soybean flour @ 2% had 6.11 fruits / bed. A significant variation in average fruit body weight (2.72 to 10.64 g per fruit), pileus diameter (4.09 to 6.72 cm), stipe length (2.62 to 4.43 cm) and stipe size (2.73 to 3.84 cm) were noted due to different treatments. The observations on yield performance due to different treatments revealed that treatment with neem cake @ 2%produced maximum yield of mushroom (841.11 g/kg dry) substrate followed by treatment, maize flour @ 2% with yield of 831.11 g/kg dry substrate whereas lowest yield of 320g/kg dry substrate was recorded in treatment soybean flour@ 2%. The investment towards flour and cakes gave an additional returns due to supplementations ranged from Rs. 3.11 to Rs. 18.94 per kg mushrooms with B:C ratio ranging from 0.91 to 2.47.

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