Copper Cu is a liquid copper fertiliser in the form of complexes, mainly used for the prevention and treatment of copper nutrient deficiencies. Copper Cu has selected organic agents, gluconic acid, lignosulfonic acids, oligosaccharides and polysaccharides. Its composition meets the plant’s needs in copper, activates its metabolism, facilitates the synthesis of polyphenols and phytoalexins and naturally enhances the cell wall of the plant tissues. Copper Cu has a systemic effect, enhanced by the organic forms of copper it contains.