I'm hoping to continue this conversation, as I just listened to Ryan's podcasts about his failed soil experiment, and I also fairly recently purchased a fish fertilizer that I'm now hesitant to use...
I'll add that one main reason (and an important one) why the compost tea didn't work for Ryan was because of the constant water flush bonsai entails. With so many flushes, the bacteria kept getting stronger but the nematodes and protozoa weren't able to hold onto anything in the soil to stick around, so the soil went downhill in a hurry.
This spring I'll be mixing my own soil of lava, pumice, and pine bark. My trees are all small and in early development stages, so I'm not worried about not having akadama, but I'm wanting to ensure I'm prepared to fertilize my trees as best as possible. Does anyone have an opinion on this:
https://www.dutchgrowers.com/fish-fertilizer-5-2-2-1l.html or any other thoughts on some less expensive fertilizer other than expensive biogold?
I'm not a scientist, but I sure enjoy the science of bonsai, so this soil/fert discussion is one I find super interesting.