id	keyword
afs-131722	soil
afs-131722	neo
afs-131722	nitrification
afs-131722	field
afs-131722	fertilizer
afs-131722	nitrogen
afs-131722	fertilization
afs-131722	cereal
afs-131722	grass
afs-131722	slurry
afs-131722	raw
afs-131722	et al
afs-131722	rates
afs-131722	field soil
afs-131722	slurries
afs-131722	g-1
afs-131722	potential
afs-131722	lab
afs-131722	soil nitrification