Abstract The effort to increase the growth and production of white oyster mushroom ( Pleurotus ostreatus ), it is necessary add nutrients sawdust which will be used as a growing medium for mushroom. One that need added minerals including Ca (calcium) Magnesium (Mg) contained in dolomite (CaMg(CO 3 ) 2 macronutrients such phosphorus TSP fertilizer. aim this research determine effect giving ferti...