The invention relates to a composition for agricultural use comprising an active ingredient consisting of a mixture of copper monogluconate and copper monogalacturonate. The invention likewise defines a process for preparing said composition and a method for applying same. The composition of the invention allows preventing or reducing in plants of many different species the attacks of various fungal or bacterial diseases, as well as mitigating the effects of various biological or environmental stress factors, acting effectively in a preventive and curative manner with lower copper concentrations and, therefore, with a lower environmental impact. It likewise activates and strengthens the defense mechanisms of plants, in addition to increasing the vigor and the development thereof, thus providing larger crops with a higher quality.
