To provide an extract liquid fertilizer, solid fuel and artificial soil obtained by effectively utilizing as a raw material, the mushroom-culture medium used for the culture of mushroom mycelia without wasting.

The extract liquid fertilizer is obtained by adding water to the mushroom mycelia-cultured medium such as the used culture medium to be discarded after mushroom bed cultivation before putrefying, agitating, and then pressurizing the mixture of the mushroom culture medium and water in which aqueous fertilizer components are dissolved into water to squeeze a liquid ingredient.