I found a lot of useful information in this thread. I'm elevated with this, but I still have some questions/ideas lingering:
Root development with seedlings
MoldSeeding depth
Success rates
I was hoping some more experienced of you could help me validate my ideas.
Root development
Smaller seeds like Pak Choi and Kohlrabi don't seem to develop roots deeper into the block. I'm using peat moss / compost / perlite in 1:3 ratio each. I used 1.6 inch blocks (4 cm). I put the seeds in to the hole (0.3 inch / 0.8 cm deep). I did not cover seeds with anything, just pressed them slightly against the block. The seedling are so weakly attached to the blocks that they easily fall over.
Mold
I observed mold development on the blocks. I used both fresh peat moss and compost as well as oven-sterilized substrates. Same result, only that the sterilized mix took longer time to mold. The important bonus with sterilized mix is the total lack of damping-off disease.
Seeding depth
Seems like it's better to drill a seed-sized pocket in the block. If the pocket made with the dibble is too large the seed has issues as described above. Alternatively, seeds need some cover (vermiculite, soil). Otherwise, even with damp/moist blocks the seeds take longer to germinate and require more watering. And this causes other issues.
Success rates
I tested this with four batches:
nonsterilized mix blocks - survival rate 9 out of 24 sample batch blocks (37%)sterilized mix blocks - 83 out 100 blocks. This includes Sage which germinates longer.traditional potting container but with the same sterilized mix: 58 out of 64 seedlings that I started in the same sterilized mix, but in traditional way - a flat potting container, 10 seedlings in a row, closely spaced, to be transplanted later to larger pots.damp kitchen cloth (I'm starting seeds in a damp warm cloth and then transplant once they germinate into the mix): almost 100% germination rate. I didn't count as a I've thrown handfuls of seeds leftover from previous batches (:. I'm still waiting to transplant these into potting medium, but the results are promising.
There is some bias, though: with each batch I'm getting more experience with temperature and watering and I water seedling with greater care.
Also, I'm a newbie, with no complete education, I'm just experimenting with whatever seemed reasonable and cool at the same time