id	keyword
easat-1658	humic
easat-1658	activity
easat-1658	soil
easat-1658	urease
easat-1658	acid
easat-1658	days
easat-1658	enzyme
easat-1658	incubation
easat-1658	bacillus
easat-1658	subtilis
easat-1658	effect
easat-1658	niger
easat-1658	doi