Subject	magnesium ion
Predicate	be needed by
Object	plants
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.7028
Neighborhood Sigma	0.7072
Local Sigma	0.8174
Example Sentences	Sentence Occurrences Source magnesium ions are needed by plants 10 Google Autocomplete, Answers.com Questions