Your efforts have been 'productive of' many benefits. [=have produced many benefits]
The farmers learned to use their land more 'productively'.
Some staff members are more 'productive' than others.
(..) enrolled Mathilda at Spencer... he told us she had problems As you know, we pride ourselves on turning troubled girls... into healthy, productive young women. But if they are not here, there is very little we can do. Mathilda left school without permission nearly two weeks ago. (..)1994 Léon: The Professional