id	keyword
ajoaa-2228	tractor
ajoaa-2228	use
ajoaa-2228	smallholder
ajoaa-2228	farmers
ajoaa-2228	tractor use
ajoaa-2228	household
ajoaa-2228	farming
ajoaa-2228	area
ajoaa-2228	labor
ajoaa-2228	study
ajoaa-2228	agriculture
ajoaa-2228	nigeria