Pleurotus ostreatus is known to utilize a wide range of agricultural by -products and organic wastes from agro-processing industries. This study was conducted in order to assess the bioconversion efficiency of oyster mushroom (Pleurotus ostreatu) on substrate composed from coffee husk supplemented with different proportion of cotton seed waste to mushroom biomass. The experiment was carried out in different mixing ratio of coffee husk with cotton seed waste for 8 levels laid in triplicate by completely randomized design. Qualitative data collected were analysed by using SPSS software version 20.0 and others were compared by LSD at (pâ‰¤ 0.05). Fastest mycelial colonization was observed on T8RII, 19.66 days, while the slowest mycelial colonization was recorded for T6RII 25 days. Fastest primordial formation was recorded for T2RII 22 days, whereas slowest primordial formation recorded for T6RII 29 days. Fastest incubation to first harvest was observed forT8RII 28.66 days while the slowest incubation to first harvest was recorded for T6RII 36.66 days. Highest number fruits recorded from T8RII 64.33 and the lowest from T6RII 42. Highest number of bunches recorded from T8RII and minimum from T6RII. Maximum number of aborts recorded from T7RII 18.33 and minimum from T6RII 11.66. Larger cap diameter recorded from T8RII 12.66 cm and smaller cap diameter from T6RII 7cm. Smaller stipe length was recorded from T4RII 2.5cm while longer stipe length was recorded from T2RII 5.33 cm. Maximum number fruits 64.33, and the highest total fresh weight were recorded from T7RII and T8RII (1015.33g/500g) and (1026g/500g) respectively. The highest biological efficiency (205.20%) obtained from T8RII. while the lowest biological efficiency was recorded from T6RII, 176.66. From all the eight level treatments, T8RII gave the highest, biological efficiency, total biomass and other parameter tested and need to be evaluated for commercial production of oyster mushroom.
Keywords: Phrases: Biological efficiency, Coffee husk, cotton seed waste, oyster mushroom, yield,