id	keyword
afs-72747	c02
afs-72747	temperatures
afs-72747	experiment
afs-72747	ambient
afs-72747	season
afs-72747	yield
afs-72747	biomass
afs-72747	grass
afs-72747	growth
afs-72747	greenhouse
afs-72747	nitrogen
afs-72747	soil