I washed my bonsai`s root ball last night with powerful water jet. Some substrate remained very attached to the roots (somewhere even parts as big as 3 stacked quarters, didn`t pulled very hard on them).
In the process the bonsai lost about 20 more leaves (some yellowing, some healthy).
I have then stole some substrate from my orchids, cut it down to 5~10mm (3/16~3/8 of an inch) and also grabbed some clay pebbles and crushed them to the same approximate size.
I packed the bonsai in its previous pot as I couldn`t find any nursery pot and then thoroughly wet it (last night it rained 3 times for my bonsai!) with a slight addition of special bonsai fertilizer with microelements (3.5% N2, 7% P2O5, 4.5% K2O, 1% MgO +++ 0.013% B, 0.003 Cu, 0.021 Fe&EDTA, 0.011% Mn, 0.0011 Mo, 0.0058 Zn).
This morning I turned on the ring fluorescent soldering light for about an hour until the light outside was very bright (well.. not brighter than the fluorescent light). Right now it`s overcast, should have left the light on all day...
Can anyone tell me how well/bad the roots look? They were not mushy at all, but rather strong. Maybe at most 10% were soft, but I don`t know how to evaluate them...
Thank you all for your advice so far, I will keep you updated with the bonsai`s health.
Didn`t want to eat the forum`s bandwidth, so here are more photos: https://drive.google.com/folderview?id= ... sp=sharing