[Pavel Chaloupka]

there are fertilizers for different stages of plant growth, so take anything for fertilization of young plants. Its quite cheap so buying more than one and trying what works best is probably the way to go. You can even buy combined fertilizer for the same purpose (young plants) it has microelements in it but that is even better. Its realy not a big deal. Or ask whoever you obtain the starting culture from, how they prepare the cultivation medium, than you can be sure to have one method that works and only improve it if you need to.