Supplementation of substrate at casing to increase the yield and quality of mushroom [Agaricus bisporus] is an important practice in commercial production of white button mushroom. This project was done to study the effect of different casing mixtures on the growth and yield of common button mushroom (Agaricus bisporus). There were significant differences between different casing mixtures compositions. The highest total yield (1066.97 g) was obtained from casing mixture, CCP + RH + Formaline + RS and lowest yield (607.93 g) was obtained from FYM+SS+Formaline. The second highest yield (646.57g) was obtained from FYM+SS+RH+Formaline casing mixture. Also the application of casing mixture CCP + RH+ formaline + RS (1:1:1) differed significantly in time taken for harvesting of first, second and third flush with that of other casing mixtures. Finally all the casing materials were evaluated for their effect on growth parameters and yield of Agaricus bisporus. Among the different casing mixture tested CCP + RH + Formaline + RS was found to be better in yield when compared to other casing mixtures. These studies will help to mushroom growers for selecting the most suitable casing materials for better growth behaviour and optimum yield potential of common button mushroom (A. bisporus) grown in our country

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