As many of you remember, I grafted a tiny piece of a Black Madeira onto a fat root of my tree while still out there in the ground (opened a hole large enough to work with, cuts using an omega grafting tool), but use whatever I had to wrapped with, in this case, some kitchen wrapping plastic to secure the joint. I put another hard stick outside the joint to secure it firmly and wrapped again. brought the dirt up to  an inch from the joint, put a cup with no bottom protecting the joint and mulched with about 6" of wood chips. Put  5 gl. water gallon without a bottom over and observed.  It grew about 12 inches from its one node cutting.  For the winter, I made another  layer of protection over the bottle with dry leaves and  a plastic holding the leaves in place.  

(here is the original post: http://figs4funforum.websitetoolbox.com/post/813-update-black-madeira-uc-davis-6283129?pid=1277506133#post1277506133)

It was in a bad spot, right in the middle of my entry gate to my garden, so it had to be moved.

Yesterday I saw its green tip ...and decided it was time to dig it up and pot it.  I dug a larger hole around it, searching for the roots.  Well, I cut some of it, while not being too careful, but still got a good amount of roots (all from my own tree) nothing from the BM.

I unwrapped all the plastic and the inner laywer was into the skin (plastic is a bad idea for this, it did not decompose and was suffocating it. on removing, I noticed that the root started to release some sap/juice.  Well, I think this joint is not strong to hold the  tree, as it was suffocated.

I replanted, but left the joint unearted. I am afraid that soil bugs will get into the 'unhealed' scar.

I am undecided if I bring soil up covering the joint, or allow it to grow with the joint exposed to air until it heals.  In this case, I should trim my 12" tree. it is too big for that joint.

or should I fill with soil covering the joint (this is cutting to root graft!) 

All input needed...Please! Anyone enlighten me!

A photo would help but from reading your account my gut feeling is that it would be better to have the wounded area exposed to air rather than it being buried below the surface of the soil. Let us know how it turns out.

It depends on what's not healed.  I would rewrap it with something breathable and support it as you did before, then leave that part exposed to air.  If the cambium is grown together and covered with at least a little bark I'd put a tiny bit of superglue on it, let that dry then rewrap and support.

Best of luck with it!

Grasa, you knocked my socks off by the first post, I never knew one can graft on a root, it was an amazing pictorial lesson for me. Coming back to your fresh injury ... expose the freshly injured part, tap dry with clean paper towel, let it completely dry from moisture them apply melted paraffin on the surface of the injured part (I use art  painting brash). As soon as it cools off you can cover with dirt and forget about it. :)

Aaron,  I did  not know either. I don't have those professional grafting tape parafin, whatever... I should get some,  I really am treasuring this young plant. I got a good size root and laterals with it,  hydrated immediately on my bunny poopy water until i got the pot ready, and quickly it went into the soil. No time to take pictures. I did not want to take a chance. My attempt to get a chunk of soil with the roots did not work, so I had to do a lot of digging to find where the leaders went. I have never done this, so I really don't know what I am doing or if it is any good for the plant.

My initial instinct was to allow it to dry out also, the injury is like a thin paper cut. Leaving uncovered i can continue to monitor it.  I am goin to make a teepee tipe frame to support its top. I don't want the BM to send roots. I want it to live with my tree roots as it has proven to be an excellent fig for this soggy city.

I like what Bob says to get some breatheable material to rewrap it. 

Grasa, just  FYI for future... Paraffin is in Supermarket shelves at Canning department, 5 blocks od 3x5 or something only 4$... It's very useful in Figging. At least for me  anyway.