Use of natural extract of tannin and non-tannin material for improving soil fertility and providing starter effect on cultivation, and tannin and non-tannin phytocomposition therefor

A use of a tannin and non-tannin material phytocomposition, either in a dry or liquid form, applied to the seedling seeds or seedling agamic multiplication members, or to implanted seedlings, to promote the starte effect, i.e. strong stimulation of the seedling initial growth. The phytocomposition is made by leaching a biomass of one or more of the following species: Castanea spp., Juglans spp., Eucalyptus spp., Quercus spp., Salix spp., Vitis spp., Mimosa spp., Schinopsis spp., Olea europoea, Onobrychis viciifolia, Rhamnus spp., Artemisia spp., Lawsonia inermis, either in a single form or in a mixture in all mixing ratios.