id	keyword
afs-59308	soil
afs-59308	et al
afs-59308	biochar
afs-59308	wheat
afs-59308	content
afs-59308	grain
afs-59308	total
afs-59308	food
afs-59308	antioxidant
afs-59308	control
afs-59308	yield
afs-59308	application
afs-59308	science
afs-59308	metals
afs-59308	ha−1
afs-59308	sl+5%bc