The planting material used by the grower is called mushroom “spawn” and the process of “sowing” this material is called spawning. The spawn is purchased from laboratories that specialize in developing and producing mushroom spawn. The pasteurized compost is inoculated with spawn [1,2] and the
compost moisture is adjusted to insure a healthy environment promoting a vigorous growth of spawn or mushroom mycelium. A pure culture of mushroom mycelium is prepared either from spores or from a piece of mushroom tissue taken from the cap or stem and grown on a nutrient base. A “pure culture” contains specific mushroom mycelium, entirely free of foreign organisms.
 Pasteurized compost tray being unload so that
spawn can be introduced