The study was conducted at Dr. Emilio B. Espinosa, Sr. Memorial State College of Agriculture and Technology (DEBESMSCAT) Cabitan, Mandaon, Masbate. experimental design used 3 x 7 CRD factorial with three varieties mushrooms (Pink Oyster, White Abalone, Milky Mushroom), seven agricultural substrates as treatments, Treatment A (70% rice straw 30% sawdust), B corn cob), C Carbonized Rice Hull), D ...