id	keyword
american_scientific_journal-4816	farmers
american_scientific_journal-4816	crop
american_scientific_journal-4816	soil
american_scientific_journal-4816	vol
american_scientific_journal-4816	knowledge
american_scientific_journal-4816	research
american_scientific_journal-4816	use
american_scientific_journal-4816	scientific
american_scientific_journal-4816	control
american_scientific_journal-4816	constraints
american_scientific_journal-4816	journal
american_scientific_journal-4816	species
american_scientific_journal-4816	technology
american_scientific_journal-4816	sciences
american_scientific_journal-4816	weeds