Foster is a biological solubilizer for legumes and non-legumes. It is formulated with Pseudomonas fluorescens. These bacteria develop on the surface of the roots and act, by means of the phosphatase enzyme, solubilizing the phosphorus retained in the soil by Fe and Al ions and clays and transforming it into available so that it can be used by the plant. In addition, it produces growth-promoting substances such as hormones, citric acid and oxalic acid that help accelerate germination and improve root development.