Hey Stefano,

unfortunately I think I can not help you much with the direct fertilisation. I´m from Germany and do not know your products and allowence arround. But I could help you out with some biodynamic practics I use after harvest that are quite easy to apply. First we spray horn silica to the still green leaves to strengthen the maturation of the wood and help move nutrients back to the roots. With leavefall, or bevore when you have infection with mildew, we spray a tea of Equisetum avense to prevent spores from swelling and reduce fungal pressure above the soil (120g/ha boiling for minimum one hour) sorry for the metrics…

I hope I could help you out a little.

Greetings from Germany