RE: What is it?
Dave - When soybeans are young in the three leaf phase - the stems are still very hairy - this can probably tell you whether or not its soybeans. Not to many plants planted in rows have 2" leaves - it really sounds like a bean.
Its also possible its some other kind of bean - maybe a simple grean bean? - But whatever it is - if its planted in rows, it' s so it can be harvested with a picker of some kind. Otherwise - it would be just broadcast or drilled like clover or alfalfa.