id	keyword
ahs-8098	cover
ahs-8098	soil
ahs-8098	cost
ahs-8098	straw
ahs-8098	lettuce
ahs-8098	planting
ahs-8098	spacing
ahs-8098	et al
ahs-8098	production
ahs-8098	plastic
ahs-8098	usd
ahs-8098	toc
ahs-8098	0.25x0.25