id	keyword
american_scientific_journal-2149	water
american_scientific_journal-2149	irrigation
american_scientific_journal-2149	drip
american_scientific_journal-2149	depth
american_scientific_journal-2149	maize
american_scientific_journal-2149	system
american_scientific_journal-2149	research
american_scientific_journal-2149	growth
american_scientific_journal-2149	flow