id	keyword
american_scientific_journal-5484	plants
american_scientific_journal-5484	ludwigii
american_scientific_journal-5484	growth
american_scientific_journal-5484	barley
american_scientific_journal-5484	vol
american_scientific_journal-5484	bacteria
american_scientific_journal-5484	inoculation
american_scientific_journal-5484	soil
american_scientific_journal-5484	grain
american_scientific_journal-5484	phosphate
american_scientific_journal-5484	effect