NOVELTY - Cultivation substrate comprises 55-65 wt.% corn cob, 18-25 wt.% sawdust, 15-20 wt.% selenium-enriched alfalfa powder, 0.8-2 wt.% gypsum powder, and 0.8-2 wt.% calcium superphosphate.    USE - The cultivation substrate is useful for cultivating lucid ganoderma (claimed).    ADVANTAGE - The cultivation substrate is rich in nutrients.    DETAILED DESCRIPTION - Cultivation substrate comprises 55-65 wt.% corn cob, 18-25 wt.% sawdust, 15-20 wt.% selenium-enriched alfalfa powder, 0.8-2 wt.% gypsum powder, and 0.8-2 wt.% calcium superphosphate. The selenium-enriched alfalfa powder is prepared by cultivating alfalfa, spraying 110-280 mg/kg fertilizer solution, where fertilizer is sprayed at a rate of 50 kg/667 m2 when alfalfa is grown to a height of 10-15 cm once in every 9 days, harvesting the alfalfa during flowering period, drying the harvested alfalfa, and crushing the alfalfa to a particle diameter of 0.5-1.5 mm, where fertilizer solution is sprayed 3 times during heavy rain. The fertilizer solution comprises 11-15 pts. wt. ammonium molybdate tetrahydrate, 10-14 pts. wt. zinc sulfate heptahydrate, 12-16 pts. wt. copper(II) sulfate pentahydrate, 14-18 pts. wt. ferrous sulfate heptahydrate, 9-13 pts. wt. anhydrous boric acid, 13-17 pts. wt. manganese sulfate, 6-10 pts. wt. potassium iodide, 3-7 pts. wt. cobalt sulfate, 4-6 pts. wt. magnesium sulfate, 11-140 pts. wt. sodium selenite, 12-15 pts. wt. fulvic acid, and 5-9 pts. wt. sodium dodecylbenzenesulfonate. An INDEPENDENT CLAIM is included for method for preparing the cultivation substrate which involves mixing corn cob, sawdust, selenium-enriched alfalfa powder, gypsum powder, and calcium superphosphate, adding water to the mixture until water content reaches 60-65%, packaging the mixture in a bag, steam sterilizing the bag at atmospheric pressure, heating the bag at a temperature of 100 degrees C for 9-11 hours, stopping heating after 11-13 hours, and removing the bag after temperature falls below 25 degrees C.