id	keyword
brj-23923	soil
brj-23923	et al
brj-23923	slurry
brj-23923	biogas
brj-23923	doi
brj-23923	pig
brj-23923	biogas slurry
brj-23923	sandy
brj-23923	article
brj-23923	china
brj-23923	microbial
brj-23923	cycling
brj-23923	incorporation