id	keyword
brj-25210	soil
brj-25210	surface
brj-25210	biochar
brj-25210	soil surface
brj-25210	properties
brj-25210	et al
brj-25210	fertilizer
brj-25210	charge
brj-25210	doi
brj-25210	content
brj-25210	nitrogen
brj-25210	application