id	keyword
afs-72114	fertilization
afs-72114	nitrogen
afs-72114	rotation
afs-72114	soil
afs-72114	monoculture
afs-72114	content
afs-72114	level
afs-72114	activity
afs-72114	effect
afs-72114	plots
afs-72114	crop
afs-72114	ley