Fecha de publicación: -- Fuente: WIPO "tomato" The present invention relates to a composition for growth media and/or crop solutions and/or plants comprising the combination of: —a carboxylic acid, —a polysaccharide, —calcium, and —a microalgae. The invention additionally relates to the use of the composition according to the invention, to promote the formation of bacterial biofilms and/or the maturation thereof on the growth medium, the rhizosphere and/or the roots of a plant.