In this study spent mushroom substrate has ingredient raising rice bed soil. spent mushroom substrates are organiccontent is 60.72% were nitrogen - phosphoric acid - potassium is 1.39 - 0.89 - 0.81% of the chemical characteristics determine.Post-harvested mushroom substrates of the stabilization process, the temperature of the 20 days time progress in the pH of therise and fall of temperature down were germination index also 77, as identified, Spent mushroom substrate bed soil for raisingrice Ingredient to take advantage of the 20 days or more stabilization process needed to be investigated. Rice seed germinationcharacteristic is in the common bed soil for raising rice ingredients manufactured control group and the comparison in spentmushroom substrate is 10% or less of a mixed experimental population of the germination rate is 82% was more than averagedays to germination and germination energy, even a statistical significant difference is or control group than good level was ok.Growth initial also spent mushroom substrate is 10% or less of a mixed experimental population of shoot dry matter (top) andgrave less than control group higher as confirmed spent mushroom substrates are bed soil for raising rice ingredients are likely totake advantage of the high, as was the judge.