Effects of biochar amendment on wheat production, mycorrhizal status, soil microbial community, and properties of an Andisol in Southern Chile

•Oat hull biochar has a significantly higher N, P, K content than Pine bark biochar.•Biochar significantly improved shoot and root biomass of T. aestivum.•Biochar promotes changes in soil fungal and bacterial communities.•The biochar stimulates positively the indigenous AM fungi propagules.•The treatments assayed enhance some soil quality properties in a volcanic soil.