International Journal of Engineering and Technology

This experiment conducted in Location of Horticulture department / Raparin university during 21th December to 15thfebruary, to study the effect of different level of Calcium carbonate (CaCO3) on growth and yield of Oyster Mushroom. This experiment included the study of four level of lime (CaCO3) that (0, 10, 15, 20)gm /15 kg with three replication. The experiment was laid out in a completely randomized design (CRD) with three replications and six treatments The effect of lime relate with pH media that mushroom grow in it. The pH is an important factor for good production of Oyster mushroom. Most of the mushrooms grow and perform well at pH near to neutral or light basic. Lime (CaCO3) is an important constituent in mushroom cultivation, commercial cultivation of mushroom depends upon proper adjustment of pH of substrate. Most of the substrates used for the cultivation ofmushroom have pH approximately near to neutral.