The effect of sludge dairy cattle and expired milk powder waste as growth media for white oyster mushroom (Pleurotus florida)

White oyster mushroom media must add additional nutrients as stimulants for mushroom growth like bran, but bran is cattle feed so its availability is limited. Sludge biogas of cattle and expired milk powder waste is the result of livestock waste which is still rich in nutrients which are important substances. This study aims to determine the effect of differences in the composition of the biogas sludge media and expired milk powder waste on mushroom productivity. This study was designed with four treatments and three repetitions which difference in the ratio of the concentration of cattle biogas sludge and expired milk powder with a ratio of P0 (0g: 0g), P1 (100g: 100g), P2 (50g: 150g) P3: (150g: 50g). Data taken include mushroom growth measurement The data was processed using analysis of Variance-Completely Randomized Design Unidirectional and the average difference was tested using Duncan’s Multiple Range Test (DMRT). The best result is P2 treatment, fresh weight, a diameter of caps, stem length, and harvest time obtained the results are 124.15 gram, 10.57 cm, 5.98 cm, and 46.00 days. In this study, the greater the proportion of expired milk powder waste that was given increasingly increased the growth of white oyster mushrooms.