1. A compound mycorrhizal fungus growth promoting agent for Dioscorea composita, wherein the compound mycorrhizal fungus growth promoting agent consists of Glomus mosseae, Streptomyces chartreusis and Flavisolibacter ginsengiterrae; spore suspensions of the Glomus mosseae, Streptomyces chartreusis and Flavisolibacter ginsengiterrae have a concentration equal to or greater than 4,000 spores/mL; and based on volumes of the spore suspensions with the same concentration, a ratio of the Glomus mosseae, Streptomyces chartreusis and Flavisolibacter ginsengiterrae in the compound mycorrhizal fungus growth promoting agent is 3:3:1.
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