Its all about reads, if he's tight and tagged as a "slowplayer", check fold it down. If he's a laagy player, bet again if the turn is a blank.
If its a calling station your not supposed be there betting in the first place!
And if its a tight passive guy you might bet again if you think he's drawing or check it down if its the other way around. Imo this is one of the most importent part of your reads in nl, is he drawing or is he not?