Use soil recipe?

@GoodWeedBerlin cow manure should have enough Potassium, no (the one from Sonnenerde was 1-2-4)? Also most basesoils, at least the ones from hardware stores, come preloaded with Potassium and Phosphorous (refs for me are Hornbach and Obi)

Good afternoon, the recipe is very good... I would just switch to aged horse manure.

Looks like a good recipe. But you should leave the ready mixed soil for a month. Otherwise the ingerdients are not available for your plant(s). The second point is that I see that mix a bit short on potassium (Kalium). If the mix is just for the vegetative phase that is fine. If you want to have ingredients for the whole growing cycle, I would add some cleaned banana peel or/and plant ash in the lower part of the pot(s).