SeanS
Omono
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Can an air layer be separated and planted directly on a board, or should the layer be planted normally for a season and then repotted on a board the following season?
Shibui
Imperial Masterpiece
You can plant it direct onto the board if you want to.
However that is not the point. Your air layer should already have a good radial root system. There's no point in putting it on a board when it already has good radial roots. The few roots that grow down can easily be trimmed off next time you have the tree out.
What species are we talking about?
However that is not the point. Your air layer should already have a good radial root system. There's no point in putting it on a board when it already has good radial roots. The few roots that grow down can easily be trimmed off next time you have the tree out.
What species are we talking about?
Shibui
Imperial Masterpiece
You are getting ahead of yourself. First air layer is still 6 months away and already you have it potted up and growing 
Canada Bonsai
Chumono
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Unless the goal was to continue to grow very horizontal radial roots! A lot of my maple air layers will spend the next 10-15 years on boards! I'm aiming for a particular aesthetic, of course
james
Shohin
Yes, you can take an air layer and go directly to a board. The newly established roots are soft, and don't provide any reasonable root ball to secure your tree into the pot. When you separate your layer, screw through the board into the cut trunk base, securing it flat to the board. Now your layer won't wobble, and your new roots will have a great start.
james
Shohin
Here are some quick sketches of what I described above. Of course, this assumes the new layer trunk can accept a screw, maybe 3/4” or more.
