id	keyword
agsci-665	yield
agsci-665	p2o5
agsci-665	fertilizer
agsci-665	nitrogen
agsci-665	ha-1
agsci-665	phosphorus
agsci-665	dekoko
agsci-665	application
agsci-665	number
agsci-665	levels
agsci-665	plant