An ecological and economic approach to enhancing the agronomic quality of anaerobic digestate: Effects of adding agricultural Jiaosu on metabolism and the microbial community

•Agronomic quality of digestate was improved by adding Agricultural Jiaosu (AJ).•Adding AJ reducing free ammonia of digestate helps to reduce the phytotoxicity.•The abundance of some agricultural beneficial genera was increased by adding AJ.•We revealed links between chemical, plant, and microbial indicators in digestate.