id	keyword
afs-5812	production
afs-5812	technical
afs-5812	efficiency
afs-5812	model
afs-5812	frontier
afs-5812	change
afs-5812	farms
afs-5812	input
afs-5812	silage
afs-5812	growth
afs-5812	factors
afs-5812	grass
afs-5812	output
afs-5812	time
afs-5812	area
afs-5812	productivity