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An investigation was conducted to evaluate the efficacy of four different types of grain spawns viz; kurakkan ( Eleusine coracana ), maize ( Zea mays ), sorghum ( Sorghum bicolor ), and paddy ( Oryza sativa ) on oyster ( Pleurotus ostreatus ) mushroom production. Spawn types were based on their effects on mushroom solids (%), biological efficiency (BE %), size (g), number of sporophores, yield, yield ratio and substrate weight loss (%). Locally available kurakkan ( Eleusine coracana ), maize (broken) ( Zea mays ), sorghum ( Sorghum bicolor ), and paddy ( Oryza sativa ) were used for spawn production. The experiment was designed as a complete randomized design with three replicates. Four types of spawns were tested on a medium based on sawdust. The growing media (substrate) inoculated with kurakkan spawns showed the highest biological efficiency of 27.82± 0.12 (%) , mean yield of 52.94 ± 0.67 g, mushroom size of 7.73 ± 0.33 g and yield ratio of 23.19 ± 0.01. The harvests obtained from paddy spawn showed the highest mushroom solids of 9.97 ± 0.26 (g/100g of harvest). Highest mean numbers of sporophore (fruiting bodies) were noticed in the harvests obtained from sorghum spawn (7.67 ± 0.66). The kurakkan spawn significantly. Enhanced biological efficiency and increased size and yield, when compared with other spawn types viz; maize ( Zea mays ), sorghum ( Sorghum bicolor ), and paddy ( Oryza sativa ). Key Words : spawn; Pleurotus ostreatus; Eleusine coracana; Zea mays; Sorghum bicolor; Oryza sativa . DOI: 10.4038/tare.v11i0.1790 Tropical Agricultural Research and Extension Vol.11 2008 pp.55-59

Efficacy of different spawn types on sawdust media