id	keyword
bae-10981	fertilizer
bae-10981	crop
bae-10981	model
bae-10981	abol
bae-10981	targ
bae-10981	subsidy
bae-10981	production
bae-10981	economics
bae-10981	iran
bae-10981	scenario
bae-10981	fertilizer subsidy
bae-10981	nitrogen
bae-10981	programming
bae-10981	yield
bae-10981	agriculture
bae-10981	effects
bae-10981	land
bae-10981	area
bae-10981	policy
bae-10981	regions
bae-10981	abol targ
bae-10981	supply
bae-10981	price
bae-10981	bio