Marek, Your question will help me. I continue the story.
One advantage of this method is to maximize the preservation of the root system.
I was sowing on different bases. Filter paper, gelatin, fine sand, perlite and zeolite.
Paper: the roots grow into the substrate. And when you transfer it to burst. Bad and not comfortable.
Gelatin: when the temperature began to melt and the seeds sank to the bottom of the container. Bad, need constant monitoring.
Perlite: everybody is familiar with this material. Bad, it is lighter than water, dusty - I did not like.
Sand and zeolite: here who like to adapt. Leave these minerals in our Arsenal.
Stone wool. I use for seeding the Foundation with a thickness of 5 mm, the fibers are arranged horizontally.
In containers is done the drainage hole with the syringe needle. Great zip package for the size of the container.
If I'm leaving the place of germination for a long time or do not find time to control, nothing terrible happens.
Within 2-3 weeks after sowing I monitor the temperature and lighting.
If successful germination of seeds, glass wool is transferred to the pot 5x5cm Pot half filled with a mixture of mineral origin, the fraction of 1-3 mm. On this substrate is laid sprouts with glass wool. Then spend filling seedlings to hold that drunken forests and prevent eutrophication of surface algae.
Without tampering with the root system I make the transfer of the seedlings into a more nutritious base.
I can do the transfer indefinitely. If the seeds show a 150% germination rate and will start to push each other, it is possible to divide the substrate into several parts.
Now the seedlings are under a common cover with more light. Zip packages are removed.