You basically only need to increase the amount of water surface that comes in contact with air. This can be done with a powerhead, the outlet of your filter spraybar and with airstones.
In planted tanks you want to avoid aggressive aeration during daylight hours. The regular water circulation that comes from your filter outlet (especially if it's at the surface) is enough. Timers are really useful when it comes to programming air pumps to come on at night.
Also, higher water temperature means less oxygen will be dissolved, so don't overheat the water.